G2 – Moderate Geomagnetic Storm Alert issued on October 10

A G2 – Moderate Geomagnetic Storm Alert was issued on October 10, 2026, after the geomagnetic K-index reached a value of 6 at 17:17 UTC. The alert, issued by the NOAA Space Weather Prediction Center, is in effect for the synoptic period from 15:00 to 18:00 UTC. This alert indicates that geomagnetic activity has reached moderate storm conditions according to the NOAA Space Weather Scales.

Potential impacts primarily affect areas poleward of 55 degrees geomagnetic latitude. Power grid fluctuations can occur, and high-latitude power systems may experience voltage alarms. Satellite operators may note orientation irregularities and increased drag on low Earth-orbit satellites. High frequency (HF) radio propagation may fade at higher latitudes, and auroras could be visible as far south as New York, Wisconsin, and Washington state.

According to the latest forecast discussion, the current geomagnetic activity is associated with a negative polarity coronal hole high speed stream moving into a geoeffective position. Solar wind parameters became disturbed after 02:00 UTC, with an increase in solar wind speed and periods of southward Bz component. These conditions have led to the current G2 – Moderate geomagnetic storm levels.