G1 – Minor Geomagnetic Storm Alert issued on November 5

A G1 – Minor Geomagnetic Storm Alert was issued on November 5, 2025. The geomagnetic K-index reached 5, with the alert being triggered at 20:10 UTC and officially issued at 20:16 UTC. The affected synoptic period for this alert is from 18:00 to 21:00 UTC, and the warning is currently active.

According to NOAA’s official criteria, a G1 – Minor Geomagnetic Storm primarily affects regions poleward of 60 degrees geomagnetic latitude. Reported impacts include possible weak power grid fluctuations, minor impacts on satellite operations, and the potential for aurora sightings at high latitudes, particularly in the northern tier of the United States, such as northern Michigan and Maine.

The current activity is associated with a period of prolonged southward Bz and sustained active levels in the geomagnetic field. This period followed recent high solar activity, including an X1.8 flare from Region 4274 at 17:34 UTC on November 4, and an M7.4 flare observed at 11:19 UTC on November 5. The solar wind parameters stayed near nominal levels but were impacted by these recent solar events, contributing to the alert conditions observed today.