Weltraum Wetter

Solarwindgeschwindigkeit Solarwind-Magnetfelder Mittag 10.7cm Rauschfluss
Bt Bz

Aktualisierung

Aktualisierung

Aktualisierung
WATCH
Geomagnetic Storm Category G1 Predicted
Issued: 01.05.2025 17.50 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
May 02: G1 (Minor) May 03: None (Below G1) May 04: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 01.05.2025 13.52 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4943
Valid From: 2025 May 01 0343 UTC
Now Valid Until: 2025 May 02 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Issued: 01.05.2025 13.52 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 May 01 1350 UTC
Valid To: 2025 May 01 2359 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 01.05.2025 10.40 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4942
Valid From: 2025 May 01 0343 UTC
Now Valid Until: 2025 May 01 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 01.05.2025 05.38 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 May 01 0532 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 01.05.2025 03.43 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 May 01 0343 UTC
Valid To: 2025 May 01 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 30.04.2025 11.30 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4940
Valid From: 2025 Apr 30 0225 UTC
Now Valid Until: 2025 Apr 30 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 30.04.2025 03.00 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 30 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 30.04.2025 02.25 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 30 0225 UTC
Valid To: 2025 Apr 30 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 27.04.2025 16.32 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Apr 27 1605 UTC
Station: GOES-19

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 24.04.2025 17.16 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4938
Valid From: 2025 Apr 24 0655 UTC
Now Valid Until: 2025 Apr 25 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 24.04.2025 11.36 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4937
Valid From: 2025 Apr 24 0655 UTC
Now Valid Until: 2025 Apr 24 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 24.04.2025 07.09 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 24 0703 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 24.04.2025 06.56 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 24 0655 UTC
Valid To: 2025 Apr 24 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 21.04.2025 23.56 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4935
Valid From: 2025 Apr 21 0218 UTC
Now Valid Until: 2025 Apr 22 1159 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 21.04.2025 20.34 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 21 2033 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-Index of 6 expected
Ausgestellt: 21.04.2025 13.54 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 21 1353 UTC
Valid To: 2025 Apr 21 1800 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 21.04.2025 13.54 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 21 1352 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 21.04.2025 11.46 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 21 1142 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 21.04.2025 10.10 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 21 1010 UTC
Valid To: 2025 Apr 21 2359 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 21.04.2025 09.34 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4934
Valid From: 2025 Apr 21 0218 UTC
Now Valid Until: 2025 Apr 21 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 21.04.2025 02.25 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 21 0224 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 21.04.2025 02.18 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 21 0218 UTC
Valid To: 2025 Apr 21 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G2 Predicted
Ausgestellt: 21.04.2025 01.48 UTC
Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Apr 21: None (Below G1) Apr 22: G2 (Moderate) Apr 23: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 20.04.2025 00.56 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 20 0055 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 20.04.2025 00.41 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 20 0038 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 20.04.2025 00.38 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 20 0038 UTC
Valid To: 2025 Apr 20 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 20.04.2025 00.06 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 20 0005 UTC
Valid To: 2025 Apr 20 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G2 Predicted
Ausgestellt: 19.04.2025 20.47 UTC
Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Apr 20: None (Below G1) Apr 21: None (Below G1) Apr 22: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 19.04.2025 14.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4931
Valid From: 2025 Apr 19 0218 UTC
Now Valid Until: 2025 Apr 19 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 19.04.2025 02.27 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 19 0227 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 19.04.2025 02.19 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 19 0218 UTC
Valid To: 2025 Apr 19 1500 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Type II Radio Emission
Ausgestellt: 19.04.2025 00.07 UTC
Type II Radio Emission
Begin Time: 2025 Apr 18 2345 UTC
Estimated Velocity: 349 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 18.04.2025 04.48 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 18 0447 UTC
Valid To: 2025 Apr 18 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 18.04.2025 04.02 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 18 0357 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 18.04.2025 01.52 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 18 0152 UTC
Valid To: 2025 Apr 18 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 17.04.2025 10.12 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4928
Valid From: 2025 Apr 15 1705 UTC
Now Valid Until: 2025 Apr 17 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Ausgestellt: 16.04.2025 23.13 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 575
Valid From: 2025 Apr 16 1315 UTC
Now Valid Until: 2025 Apr 17 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 16.04.2025 23.13 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2022
Valid From: 2025 Apr 15 1730 UTC
Now Valid Until: 2025 Apr 17 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 16.04.2025 21.40 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 2136 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 8, 9-
Ausgestellt: 16.04.2025 20.54 UTC
Geomagnetic K-index of 8, 9-
Threshold Reached: 2025 Apr 16 2055 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G4 - Severe

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.

ALERT
Geomagnetic K-index of 7
Ausgestellt: 16.04.2025 19.32 UTC
Geomagnetic K-index of 7
Threshold Reached: 2025 Apr 16 1925 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

WARNING
Geomagnetic K-index of 7 or greater expected
Ausgestellt: 16.04.2025 19.31 UTC
Geomagnetic K-index of 7 or greater expected
Valid From: 2025 Apr 16 1930 UTC
Valid To: 2025 Apr 17 0000 UTC
Warning Condition: Persistence
NOAA Scale: G3 or greater

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 16.04.2025 18.53 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4927
Valid From: 2025 Apr 15 1705 UTC
Now Valid Until: 2025 Apr 17 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 16.04.2025 18.52 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2021
Valid From: 2025 Apr 15 1730 UTC
Now Valid Until: 2025 Apr 17 0300 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Ausgestellt: 16.04.2025 18.52 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 574
Valid From: 2025 Apr 16 1315 UTC
Now Valid Until: 2025 Apr 17 0000 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 6
Ausgestellt: 16.04.2025 18.45 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 16 1838 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 16.04.2025 18.32 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 1828 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 6
Ausgestellt: 16.04.2025 16.44 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 16 1634 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 16.04.2025 15.26 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 1520 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 7
Ausgestellt: 16.04.2025 14.24 UTC
Geomagnetic K-index of 7
Threshold Reached: 2025 Apr 16 1418 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

WARNING
Geomagnetic K-index of 7 or greater expected
Ausgestellt: 16.04.2025 13.25 UTC
Geomagnetic K-index of 7 or greater expected
Valid From: 2025 Apr 16 1325 UTC
Valid To: 2025 Apr 16 1800 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

ALERT
Geomagnetic K-index of 6
Ausgestellt: 16.04.2025 13.24 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 16 1321 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 16.04.2025 13.13 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 1313 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-Index of 6 expected
Ausgestellt: 16.04.2025 13.07 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 16 1315 UTC
Valid To: 2025 Apr 16 2100 UTC
Warning Condition: Persistence
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 16.04.2025 12.39 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4926
Valid From: 2025 Apr 15 1705 UTC
Now Valid Until: 2025 Apr 17 0000 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 16.04.2025 12.38 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2020
Valid From: 2025 Apr 15 1730 UTC
Now Valid Until: 2025 Apr 16 2100 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 16.04.2025 12.00 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 1159 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 16.04.2025 05.35 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2019
Valid From: 2025 Apr 15 1730 UTC
Now Valid Until: 2025 Apr 16 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 16.04.2025 05.35 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4925
Valid From: 2025 Apr 15 1705 UTC
Now Valid Until: 2025 Apr 16 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 16.04.2025 01.34 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 16 0130 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 6
Ausgestellt: 15.04.2025 22.29 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 15 2223 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 15.04.2025 22.04 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 15 2200 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

SUMMARY
Geomagnetic Sudden Impulse
Ausgestellt: 15.04.2025 21.13 UTC
Geomagnetic Sudden Impulse
Observed: 2025 Apr 15 1859 UTC
Deviation: 68 nT
Station: BOU

ALERT
Geomagnetic K-index of 6
Ausgestellt: 15.04.2025 19.52 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 15 1944 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 15.04.2025 18.59 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 15 1859 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-Index of 6 expected
Ausgestellt: 15.04.2025 18.50 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 15 1900 UTC
Valid To: 2025 Apr 16 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 15.04.2025 17.32 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 15 1732 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 15.04.2025 17.31 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 15 1730 UTC
Valid To: 2025 Apr 16 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 15.04.2025 17.29 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 15 1725 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 15.04.2025 17.07 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 15 1705 UTC
Valid To: 2025 Apr 16 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic Sudden Impulse expected
Ausgestellt: 15.04.2025 16.51 UTC
Geomagnetic Sudden Impulse expected
Valid From: 2025 Apr 15 1729 UTC
Valid To: 2025 Apr 15 1759 UTC
IP Shock Passage Observed: 2025 Apr 15 1642 UTC

WATCH
Geomagnetic Storm Category G3 Predicted
Ausgestellt: 15.04.2025 15.24 UTC
Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Apr 16: G3 (Strong) Apr 17: G1 (Minor) Apr 18: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 15.04.2025 11.16 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3453
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 1464 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 14.04.2025 23.02 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 14 2301 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 14.04.2025 23.01 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 14 2300 UTC
Valid To: 2025 Apr 15 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 14.04.2025 08.56 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4922
Valid From: 2025 Apr 14 0031 UTC
Now Valid Until: 2025 Apr 14 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 14.04.2025 05.12 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3452
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 1150 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 14.04.2025 04.41 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 14 0441 UTC
Valid To: 2025 Apr 14 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 14.04.2025 04.39 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 14 0429 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 14.04.2025 00.33 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 14 0031 UTC
Valid To: 2025 Apr 14 0900 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 13.04.2025 21.20 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3451
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 2657 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WATCH
Geomagnetic Storm Category G2 Predicted
Ausgestellt: 13.04.2025 20.07 UTC
Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Apr 14: None (Below G1) Apr 15: None (Below G1) Apr 16: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 13.04.2025 08.19 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4920
Valid From: 2025 Apr 12 1636 UTC
Now Valid Until: 2025 Apr 13 2359 UTC
Warning Condition: persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 12.04.2025 22.45 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4919
Valid From: 2025 Apr 12 1636 UTC
Now Valid Until: 2025 Apr 13 0900 UTC
Warning Condition: persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 12.04.2025 22.20 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 12 2220 UTC
Valid To: 2025 Apr 13 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 12.04.2025 17.46 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 12 1746 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 12.04.2025 16.36 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 12 1636 UTC
Valid To: 2025 Apr 13 0300 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 12.04.2025 07.03 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3450
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 3362 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 11.04.2025 23.41 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4917
Valid From: 2025 Apr 10 2243 UTC
Now Valid Until: 2025 Apr 12 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 11.04.2025 17.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4916
Valid From: 2025 Apr 10 2243 UTC
Now Valid Until: 2025 Apr 11 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G1 Predicted
Ausgestellt: 11.04.2025 14.08 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 12: G1 (Minor) Apr 13: None (Below G1) Apr 14: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 11.04.2025 05.34 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4915
Valid From: 2025 Apr 10 2243 UTC
Now Valid Until: 2025 Apr 11 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 11.04.2025 04.59 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3449
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 3362 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 10.04.2025 22.59 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 10 2300 UTC
Valid To: 2025 Apr 11 0300 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 10.04.2025 22.46 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 10 2247 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 10.04.2025 22.42 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 10 2243 UTC
Valid To: 2025 Apr 11 0600 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 10.04.2025 08.33 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4913
Valid From: 2025 Apr 10 0107 UTC
Now Valid Until: 2025 Apr 10 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 10.04.2025 07.56 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3448
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 3893 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 10.04.2025 01.41 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 10 0141 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 10.04.2025 01.08 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 10 0107 UTC
Valid To: 2025 Apr 10 0900 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 09.04.2025 08.39 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4911
Valid From: 2025 Apr 07 2022 UTC
Now Valid Until: 2025 Apr 09 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 09.04.2025 08.38 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2014
Valid From: 2025 Apr 08 1436 UTC
Now Valid Until: 2025 Apr 09 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 09.04.2025 05.21 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3447
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 10269 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 09.04.2025 01.51 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 09 0145 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 08.04.2025 20.56 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2013
Valid From: 2025 Apr 08 1436 UTC
Now Valid Until: 2025 Apr 09 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 08.04.2025 20.56 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4910
Valid From: 2025 Apr 07 2022 UTC
Now Valid Until: 2025 Apr 09 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 08.04.2025 15.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 08 1459 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 08.04.2025 14.41 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4909
Valid From: 2025 Apr 07 2022 UTC
Now Valid Until: 2025 Apr 08 2100 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 08.04.2025 14.36 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 08 1436 UTC
Valid To: 2025 Apr 08 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Type II Radio Emission
Ausgestellt: 08.04.2025 06.14 UTC
Type II Radio Emission
Begin Time: 2025 Apr 08 0553 UTC
Estimated Velocity: 456 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 08.04.2025 05.02 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4908
Valid From: 2025 Apr 07 2022 UTC
Now Valid Until: 2025 Apr 08 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 08.04.2025 04.59 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3446
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 17878 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 07.04.2025 20.39 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 07 2039 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 07.04.2025 20.22 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 07 2022 UTC
Valid To: 2025 Apr 08 0600 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 07.04.2025 04.59 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3445
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 9243 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 06.04.2025 23.58 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4906
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 07 0559 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 06.04.2025 05.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4905
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 06 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 06.04.2025 05.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3444
Begin Time: 2025 Apr 05 1225 UTC
Yesterday Maximum 2MeV Flux: 2350 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 06.04.2025 01.55 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2011
Valid From: 2025 Apr 05 2005 UTC
Now Valid Until: 2025 Apr 06 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 06.04.2025 01.52 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 06 0150 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-Index of 6 expected
Ausgestellt: 05.04.2025 20.33 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 05 2032 UTC
Valid To: 2025 Apr 06 0300 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 05.04.2025 20.20 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 05 2020 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 05.04.2025 20.06 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 05 2005 UTC
Valid To: 2025 Apr 06 0300 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 05.04.2025 17.56 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4904
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 06 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Ausgestellt: 05.04.2025 12.44 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Apr 05 1225 UTC
Station: GOES16

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 05.04.2025 04.05 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 05 0405 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 6
Ausgestellt: 05.04.2025 03.00 UTC
Geomagnetic K-index of 6
Threshold Reached: 2025 Apr 05 0259 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

WARNING
Geomagnetic K-Index of 6 expected
Ausgestellt: 05.04.2025 02.11 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 05 0210 UTC
Valid To: 2025 Apr 05 1200 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 05.04.2025 00.51 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 05 0051 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 05.04.2025 00.49 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 05 0050 UTC
Valid To: 2025 Apr 05 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 05.04.2025 00.47 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4903
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 05 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 04.04.2025 23.19 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 04 2317 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 04.04.2025 14.20 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2008
Valid From: 2025 Apr 03 1943 UTC
Now Valid Until: 2025 Apr 04 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-Index of 6 expected
Ausgestellt: 04.04.2025 14.20 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2025 Apr 04 1418 UTC
Valid To: 2025 Apr 04 2100 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 04.04.2025 14.20 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4902
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 05 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 04.04.2025 13.07 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 04 1307 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 04.04.2025 05.49 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2007
Valid From: 2025 Apr 03 1943 UTC
Now Valid Until: 2025 Apr 04 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 04.04.2025 05.48 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4901
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 04 2100 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 04.04.2025 00.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 03 2359 UTC
Synoptic Period: 2100-0000 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Ausgestellt: 03.04.2025 20.02 UTC
Geomagnetic K-index of 5
Threshold Reached: 2025 Apr 03 2002 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 03.04.2025 19.43 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 03 1943 UTC
Valid To: 2025 Apr 04 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 03.04.2025 17.56 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4900
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 04 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 03.04.2025 17.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4899
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 03 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 03.04.2025 09.05 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4898
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 03 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G1 Predicted
Ausgestellt: 02.04.2025 21.12 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 03: None (Below G1) Apr 04: G1 (Minor) Apr 05: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 02.04.2025 20.59 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4897
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 03 1000 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

SUMMARY
Proton Event 10MeV Integral Flux exceeded 10pfu
Ausgestellt: 02.04.2025 18.24 UTC
Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2025 Mar 31 1105 UTC
Maximum Time: 2025 Apr 01 0425 UTC
End Time: 2025 Apr 02 0910 UTC
Maximum 10MeV Flux: 147 pfu
NOAA Scale: S2 - Moderate

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Ausgestellt: 02.04.2025 11.02 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 599
Valid From: 2025 Mar 31 1057 UTC
Now Valid Until: 2025 Apr 02 1800 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 02.04.2025 08.51 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 2005
Valid From: 2025 Apr 02 0233 UTC
Now Valid Until: 2025 Apr 02 1500 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 02.04.2025 08.51 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4896
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 02 2100 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 02.04.2025 02.34 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 4895
Valid From: 2025 Apr 02 0123 UTC
Now Valid Until: 2025 Apr 02 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Ausgestellt: 02.04.2025 02.34 UTC
Geomagnetic K-index of 5 expected
Valid From: 2025 Apr 02 0233 UTC
Valid To: 2025 Apr 02 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Ausgestellt: 02.04.2025 01.33 UTC
Geomagnetic K-index of 4
Threshold Reached: 2025 Apr 02 0132 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Ausgestellt: 02.04.2025 01.23 UTC
Geomagnetic K-index of 4 expected
Valid From: 2025 Apr 02 0123 UTC
Valid To: 2025 Apr 02 0600 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G1 Predicted
Ausgestellt: 02.04.2025 00.23 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 02: None (Below G1) Apr 03: None (Below G1) Apr 04: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Ausgestellt: 01.04.2025 23.37 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 598
Valid From: 2025 Mar 31 1057 UTC
Now Valid Until: 2025 Apr 02 1200 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

SUMMARY
Proton Event 10MeV Integral Flux exceeded 100pfu
Ausgestellt: 01.04.2025 18.15 UTC
Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2025 Apr 01 0205 UTC
Maximum Time: 2025 Apr 01 0425 UTC
End Time: 2025 Apr 01 0910 UTC
Maximum 10MeV Flux: 147 pfu
NOAA Scale: S2 - Moderate

Tabelle

Datum Radio flux 10.7 cm SESC Sonnenflecken Anzahl Sonnenfleckenbereich 10E-6 Neue Region GOES15 X-ray Bkgd flux Lichtblitze
X-ray Optisch
C M X S 1 2 3
01.04.25 182 147 950 0 * 12 2 0 10 0 0 0
02.04.25 180 158 1030 1 * 12 0 0 3 1 0 0
03.04.25 178 124 930 0 * 5 0 0 3 0 0 0
04.04.25 180 163 1010 3 * 5 0 0 3 0 0 0
05.04.25 184 160 1010 2 * 9 1 0 2 0 0 0
06.04.25 167 140 1070 1 * 4 0 0 5 0 0 0
07.04.25 162 167 1140 1 * 6 0 0 2 1 0 0
08.04.25 159 130 830 0 * 5 1 0 4 1 0 0
09.04.25 167 113 680 2 * 9 0 0 1 1 0 0
10.04.25 153 112 680 1 * 7 0 0 6 0 0 0
11.04.25 170 120 760 1 * 9 2 0 19 1 0 0
12.04.25 165 103 1110 0 * 15 7 0 8 3 0 0
13.04.25 164 80 1100 0 * 8 10 0 3 4 0 0
14.04.25 152 86 1070 0 * 9 2 0 1 0 0 0
15.04.25 153 58 410 1 * 4 2 0 2 0 0 0
16.04.25 148 70 500 2 * 4 0 0 1 0 0 0
17.04.25 151 118 710 2 * 6 0 0 1 0 0 0
18.04.25 156 113 870 1 * 5 1 0 1 0 0 0
19.04.25 157 114 840 0 * 2 0 0 5 0 0 0
20.04.25 156 108 790 0 * 4 1 0 3 0 0 0
21.04.25 163 137 830 1 * 2 1 0 4 1 0 0
22.04.25 163 142 610 3 * 2 1 0 6 0 0 0
23.04.25 167 132 700 1 * 6 0 0 9 0 0 0
24.04.25 170 152 600 1 * 5 0 0 4 0 0 0
25.04.25 164 169 810 4 * 4 0 0 1 0 0 0
26.04.25 156 172 530 0 * 4 0 0 1 0 0 0
27.04.25 156 119 420 0 * 5 0 0 2 0 0 0
28.04.25 154 134 660 2 * 7 0 0 6 0 0 0
29.04.25 149 105 830 0 * 12 3 0 10 3 0 0
30.04.25 148 77 1190 0 * 4 1 0 2 0 1 0
Mittelwert/Total 162 124 822 30 191 35 0 128 16 1 0

Übersichtsgrafik

Lichtblitze

Solar wind

Solar Wind

The solar wind is a stream of plasma released from the upper atmosphere of the Sun. It consists of mostly electrons, protons and alpha particles with energies usually between 1.5 and 10 keV. The stream of particles varies in density, temperature, and speed over time and over solar longitude. These particles can escape the Sun's gravity because of their high energy, from the high temperature of the corona and magnetic, electrical and electromagnetic phenomena in it.

The solar wind is divided into two components, respectively termed the slow solar wind and the fast solar wind. The slow solar wind has a velocity of about 400 km/s, a temperature of 1.4–1.6×10e6 K and a composition that is a close match to the corona. By contrast, the fast solar wind has a typical velocity of 750 km/s, a temperature of 8×10e5 K and it nearly matches the composition of the Sun's photosphere. The slow solar wind is twice as dense and more variable in intensity than the fast solar wind. The slow wind also has a more complex structure, with turbulent regions and large-scale structures.

Solar radio flux at 10.7 cm

Solar radio flux at 10.7 cm

The solar radio flux at 10.7 cm (2800 MHz) is an excellent indicator of solar activity. Often called the F10.7 index, it is one of the longest running records of solar activity. The F10.7 radio emissions originates high in the chromosphere and low in the corona of the solar atmosphere. The F10.7 correlates well with the sunspot number as well as a number of UltraViolet (UV) and visible solar irradiance records. Reported in “solar flux units”, (s.f.u.), the F10.7 can vary from below 50 s.f.u., to above 300 s.f.u., over the course of a solar cycle.

Flares

Flares

A solar flare is a sudden flash of brightness observed over the Sun's surface or the solar limb, which is interpreted as a large energy release of up to 6 × 10e25 joules of energy. They are often, but not always, followed by a colossal coronal mass ejection. The flare ejects clouds of electrons, ions, and atoms through the corona of the sun into space. These clouds typically reach Earth a day or two after the event.

Solar flares affect all layers of the solar atmosphere (photosphere, chromosphere, and corona), when the plasma medium is heated to tens of millions of kelvin, while the electrons, protons, and heavier ions are accelerated to near the speed of light. They produce radiation across the electromagnetic spectrum at all wavelengths, from radio waves to gamma rays, although most of the energy is spread over frequencies outside the visual range and for this reason the majority of the flares are not visible to the naked eye and must be observed with special instruments. Flares occur in active regions around sunspots, where intense magnetic fields penetrate the photosphere to link the corona to the solar interior. Flares are powered by the sudden (timescales of minutes to tens of minutes) release of magnetic energy stored in the corona. The same energy releases may produce coronal mass ejections (CME), although the relation between CMEs and flares is still not well established.

The frequency of occurrence of solar flares varies, from several per day when the Sun is particularly "active" to less than one every week when the Sun is "quiet", following the 11-year cycle (the solar cycle). Large flares are less frequent than smaller ones.

Classification

Solar flares are classified as A, B, C, M or X according to the peak flux (in watts per square metre, W/m2) of 100 to 800 picometre X-rays near Earth, as measured on the GOES spacecraft.

Classification Peak Flux Range at 100-800 picometer
W/m2
A < 10e-7
B 10e-7 to 10e-6
C 10e-6 to 10e-5
M 10e-5 to 10e-4
X 10e-4 to 10e-3
Z > 10e-3

An earlier flare classification is based on Hα spectral observations. The scheme uses both the intensity and emitting surface. The classification in intensity is qualitative, referring to the flares as: (f)aint, (n)ormal or (b)rilliant. The emitting surface is measured in terms of millionths of the hemisphere and is described below. (The total hemisphere area AH = 6.2 × 1012 km2.)

Classification Corrected area
(millionths of hemisphere)
S < 100
1 100 - 250
2 250 - 600
3 600 - 1200
4 > 1200

Sunspot number

Sunspots

Sunspots are temporary phenomena on the photosphere of the Sun that appear visibly as dark spots compared to surrounding regions. They correspond to concentrations of magnetic field that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere. Sunspots usually appear in pairs, with pair members of opposite magnetic polarity. The number of sunspots varies according to the approximately 11-year solar cycle.

Sunspot populations quickly rise and more slowly fall on an irregular cycle of 11 years, although significant variations in the number of sunspots attending the 11-year period are known over longer spans of time. For example, from 1900 to the 1960s, the solar maxima trend of sunspot count has been upward; from the 1960s to the present, it has diminished somewhat. Over the last decades the Sun has had a markedly high average level of sunspot activity; it was last similarly active over 8,000 years ago.

The number of sunspots correlates with the intensity of solar radiation over the period since 1979, when satellite measurements of absolute radiative flux became available. Since sunspots are darker than the surrounding photosphere it might be expected that more sunspots would lead to less solar radiation and a decreased solar constant. However, the surrounding margins of sunspots are brighter than the average, and so are hotter; overall, more sunspots increase the Sun's solar constant or brightness. The variation caused by the sunspot cycle to solar output is relatively small, on the order of 0.1% of the solar constant (a peak-to-trough range of 1.3 W/m2 compared to 1366 W/m2 for the average solar constant).

K-Indizes



Heute


0h
UTC
3h
UTC
6h
UTC
9h
UTC
12h
UTC
15h
UTC
18h
UTC
21h
UTC
3. 33 4. 00 3.



Data


Estimated Planetary

Estimated Planetary

Datum A K-Indizes (UTC)
0h 3h 6h 9h 12h 15h 18h 21h
02.04.25 22 4. 33 3. 67 4.
03.04.25 26 3. 67 3. 00 4.
04.04.25 33 4. 00 4. 00 4.
05.04.25 40 5. 67 5. 33 4.
06.04.25 20 5. 00 3. 33 2.
07.04.25 13 3. 00 3. 00 2.
08.04.25 24 3. 33 4. 00 3.
09.04.25 22 4. 67 3. 33 3.
10.04.25 17 4. 00 3. 33 3.
11.04.25 18 4. 33 3. 33 2.
12.04.25 20 3. 33 2. 67 3.
13.04.25 15 4. 00 3. 67 2.
14.04.25 18 3. 33 4. 33 3.
15.04.25 34 3. 33 2. 33 1.
16.04.25 77 5. 33 3. 33 3.
17.04.25 11 2. 67 4. 00 2.
18.04.25 13 3. 33 4. 00 3.
19.04.25 20 4. 00 3. 00 4.
20.04.25 14 5. 00 2. 67 2.
21.04.25 35 4. 33 4. 33 4.
22.04.25 13 3. 67 3. 00 3.
23.04.25 7 1. 67 2. 67 1.
24.04.25 13 2. 67 2. 33 3.
25.04.25 5 1. 00 1. 00 1.
26.04.25 7 2. 00 2. 00 1.
27.04.25 6 1. 33 2. 33 1.
28.04.25 5 2. 67 0. 67 0.
29.04.25 6 0. 33 1. 67 2.
30.04.25 12 3. 67 2. 67 2.
01.05.25 18 3. 33 4. 00 3.

Middle Latitude

Datum A K-Indizes
02.04.25 16 4 3 3 4 3 2 2 3
03.04.25 25 3 3 4 4 5 3 4 4
04.04.25 19 3 3 3 3 5 3 3 3
05.04.25 20 4 4 4 3 3 3 3 3
06.04.25 17 4 3 2 3 4 3 3 3
07.04.25 10 2 2 2 2 3 2 3 3
08.04.25 20 2 4 3 3 5 3 3 3
09.04.25 20 4 3 3 4 4 3 3 3
10.04.25 11 3 2 3 2 2 1 2 4
11.04.25 14 3 2 2 2 4 2 3 4
12.04.25 13 2 2 3 3 3 3 3 3
13.04.25 14 4 4 2 2 3 2 3 2
14.04.25 14 3 4 3 2 3 2 2 3
15.04.25 13 3 2 2 1 2 3 1 5
16.04.25 43 5 3 3 4 6 4 6 5
17.04.25 11 2 4 2 2 3 3 1 2
18.04.25 11 3 4 2 2 3 2 1 2
19.04.25 18 4 3 3 2 4 3 2 4
20.04.25 11 4 1 2 1 2 2 3 3
21.04.25 24 4 4 3 4 5 3 4 2
22.04.25 13 4 3 3 2 3 2 2 2
23.04.25 9 1 2 2 4 3 2 1 1
24.04.25 14 2 2 4 3 4 2 3 2
25.04.25 5 1 1 1 2 2 1 2 2
26.04.25 7 2 1 1 2 2 3 2 2
27.04.25 7 2 2 1 2 3 2 2 1
28.04.25 5 2 0 1 2 2 1 2 1
29.04.25 6 0 2 2 2 2 2 2 2
30.04.25 14 3 2 4 4 2 1 2 3
01.05.25 3 3 4 3 4

High Latitude

Datum A K-Indizes
02.04.25 29 3 5 5 5 4 3 3 3
03.04.25 46 4 2 6 5 6 5 5 4
04.04.25 44 3 4 5 5 6 6 4 4
05.04.25 47 4 4 6 6 5 5 5 3
06.04.25 36 4 3 4 6 5 5 4 3
07.04.25 13 3 3 2 3 3 3 3 2
08.04.25 30 3 3 5 3 6 5 3 2
09.04.25 44 5 4 6 6 5 5 3 2
10.04.25 30 5 5 6 4 2 2 2 3
11.04.25 22 5 3 3 4 4 3 3 3
12.04.25 32 3 2 5 4 5 5 5 3
13.04.25 18 4 3 4 4 4 2 2 2
14.04.25 28 4 6 4 4 3 4 2 3
15.04.25 19 2 2 2 3 4 3 5 4
16.04.25 63 3 3 3 4 7 7 7 3
17.04.25 7 2 4 1 1 2 1 1 1
18.04.25 15 3 3 3 3 3 4 2 2
19.04.25 49 4 3 7 6 5 5 2 4
20.04.25 13 3 2 2 4 3 2 3 2
21.04.25 37 3 5 5 5 5 5 4 3
22.04.25 14 3 2 4 3 3 3 2 2
23.04.25 12 1 2 2 5 3 2 2 1
24.04.25 22 2 2 5 5 5 2 2 1
25.04.25 4 1 1 1 0 1 1 2 2
26.04.25 15 2 2 1 5 5 1 1 1
27.04.25 4 1 2 1 0 1 2 2 1
28.04.25 2 2 1 0 1 0 0 0 0
29.04.25 7 0 2 3 3 2 1 2 1
30.04.25 22 2 3 5 6 2 1 2 2
01.05.25 3 4 5 5 5

About

The K-index quantifies disturbances in the horizontal component of earth's magnetic field with an integer in the range 0–9 with 1 being calm and 5 or more indicating a geomagnetic storm. It is derived from the maximum fluctuations of horizontal components observed on a magnetometer during a three-hour interval. The label K comes from the German word Kennziffer meaning “characteristic digit”. The K-index was introduced by Julius Bartels in 1938.

The Estimated 3-hour Planetary Kp-index is derived at the NOAA Space Weather Prediction Center using data from the following ground-based magnetometers:

  • Sitka, Alaska
  • Meanook, Canada
  • Ottawa, Canada
  • Fredericksburg, Virginia
  • Hartland, UK
  • Wingst, Germany
  • Niemegk, Germany
  • Canberra, Australia

These data are made available thanks to the cooperative efforts between SWPC and data providers around the world, which currently includes the U.S. Geological Survey, Natural Resources Canada (NRCAN), the British Geological Survey, the German Research Centre for Geosciences (GFZ), and Geoscience Australia. Important magnetometer observations are also contributed by the Institut de Physique du Globe de Paris and the Korean Space Weather Center K-index Watches are issued when the highest predicted NOAA estimated Kp-indices for a day are K = 5, 6, 7, or >= 8 and is reported in terms of the NOAA G scale. K-index Warnings are issued when NOAA estimated Kp-indices of 4, 5, 6, and 7 or greater are expected. K-index Alerts are issued when the NOAA estimated Kp-indices reach 4, 5, 6, 7, 8, or 9.


More info
Datenquelle: NOAA, Wikipedia

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