G1 – Minor Geomagnetic Storm Alert issued on October 10

A G1 – Minor Geomagnetic Storm Alert was issued on October 10, 2026 after the geomagnetic K-index reached a value of 5. The alert is valid for the synoptic period from 15:00 UTC to 18:00 UTC. Active warning conditions are in effect as of 15:35 UTC.

Potential impacts from this event are mostly limited to areas poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations are possible due to induced currents. Minor impacts on satellite operations may occur. Auroras may be visible at high latitudes, potentially including areas such as northern Michigan and Maine in the United States.

The geomagnetic disturbance has been triggered by the arrival of a negative polarity coronal hole high speed stream moving into a geoeffective position. According to the latest forecast discussion, additional enhancements in activity are expected on October 10. Stronger disturbances, including possible G1 – Minor and G2 – Moderate geomagnetic storm conditions, are anticipated on October 11 due to the ongoing effects of the coronal hole high speed stream and the expected arrival of coronal mass ejections (CMEs) from recent solar activity.