aurorainfo.eu - be in the right place at the right time

Issue Time: 2025-12-04 21:29 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day
Dec 05: None (Below G1) Dec 06: None (Below G1) Dec 07: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
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.

Issue Time: 2025-12-04 13:21 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5172
Valid From: 2025-12-03 10:22 UTC
Now Valid Until: 2025-12-05 18:00 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2025-12-04 11:58 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2146
Valid From: 2025-12-03 14:25 UTC
Now Valid Until: 2025-12-05 00:00 UTC
Warning Condition: Persistence
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.

Issue Time: 2025-12-04 09:00 UTC
ALERT: Type IV Radio Emission
Begin Time: 2025-12-04 08:32 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

Issue Time: 2025-12-04 08:55 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025-12-04 08:52 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2025-12-04 04:53 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025-12-04 04:45 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2025-12-04 03:08 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2025-12-04 02:36 UTC
Maximum Time: 2025-12-04 02:50 UTC
End Time: 2025-12-04 02:59 UTC
X-ray Class: M6.0
Optical Class: na
Location: N07E50
NOAA Scale: R2 - Moderate
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

Issue Time: 2025-12-04 03:03 UTC
ALERT: Type II Radio Emission
Begin Time: 2025-12-04 02:46 UTC
Estimated Velocity: 345 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.

Issue Time: 2025-12-04 02:53 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025-12-04 02:47 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2025-12-04 02:50 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025-12-04 02:48 UTC
NOAA Scale: R2 - Moderate

Issue Time: 2025-12-03 23:56 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2145
Valid From: 2025-12-03 14:25 UTC
Now Valid Until: 2025-12-04 12:00 UTC
Warning Condition: Persistence
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.

Issue Time: 2025-12-03 23:55 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5171
Valid From: 2025-12-03 10:22 UTC
Now Valid Until: 2025-12-04 18:00 UTC
Warning Condition: Persistence
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2025-12-03 22:38 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025-12-03 22:15 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2025-12-03 20:48 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2025-12-03 20:31 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong
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.

Issue Time: 2025-12-03 20:27 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2025-12-03 20:25 UTC
Valid To: 2025-12-03 23:59 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater
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.

Issue Time: 2025-12-03 19:58 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2025-12-03 19:59 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate
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.

Issue Time: 2025-12-03 19:53 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2025-12-03 19:52 UTC
Valid To: 2025-12-03 23:59 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
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.

Issue Time: 2025-12-03 19:41 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025-12-03 19:41 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2025-12-03 14:52 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025-12-03 14:43 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor
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.

Issue Time: 2025-12-03 14:25 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025-12-03 14:25 UTC
Valid To: 2025-12-04 00:00 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
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.

Issue Time: 2025-12-03 14:23 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2025-12-03 14:19 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2025-12-03 10:22 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025-12-03 10:22 UTC
Valid To: 2025-12-03 23:59 UTC
Warning Condition: Onset
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Issue Time: 2025-12-03 07:06 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3569
Begin Time: 2025-11-25 14:50 UTC
Yesterday Maximum 2MeV Flux: 8535 pfu

Issue Time: 2025-12-02 05:01 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3568
Begin Time: 2025-11-25 14:50 UTC
Yesterday Maximum 2MeV Flux: 8521 pfu