G1 – Minor Geomagnetic Storm Alert issued on October 31

A G1 – Minor Geomagnetic Storm Alert was issued on October 31, 2025, after the geomagnetic K-index reached 5 between 03:00 and 06:00 UTC. The alert was issued by NOAA’s Space Weather Prediction Center at 06:02 UTC and is currently active.

According to the alert, the area of impact is primarily poleward of 60 degrees geomagnetic latitude. Potential impacts include weak power grid fluctuations due to induced currents, minor possible effects on satellite operations, and the possibility of aurora visibility at high latitudes, such as the northern tier of the U.S., including northern Michigan and Maine.

NOAA SWPC reported that the geomagnetic storm conditions are due to persistent positive polarity coronal hole high-speed stream (CH HSS) influences. Solar wind speed peaked around 650 km/s during the period, driving the geomagnetic field to unsettled to G1 – Minor storm levels. No Earth-directed coronal mass ejection (CME) activity was confirmed as a contributing factor for this event.