G2 – Moderate Geomagnetic Storm Alert issued on October 31

A G2 – Moderate Geomagnetic Storm Alert was issued on October 31, 2026, after the geomagnetic K-index reached 6. The alert covers the synoptic period from 18:00 UTC to 21:00 UTC. The alert remains active as of issuance at 19:14 UTC.

Potential impacts from this G2 – Moderate event include possible power grid fluctuations, particularly affecting regions poleward of 55 degrees geomagnetic latitude. High-latitude power systems may experience voltage alarms. Satellite operators may observe irregularities in satellite orientation, and low Earth-orbit spacecraft could be subject to increased atmospheric drag. HF radio communications may experience fading at higher latitudes, and auroral activity may be visible as far south as New York, Wisconsin, and Washington state.

The triggering event for this geomagnetic disturbance was enhanced solar wind conditions associated with a positive polarity coronal hole high speed stream (CH HSS). These conditions led to increased solar wind speeds and magnetic field strength, influencing the geomagnetic field and resulting in elevated storm levels.