G1 – Minor Geomagnetic Storm Alert issued on March 25

A G1 – Minor Geomagnetic Storm Alert was issued for March 25, 2026. The alert was triggered after the geomagnetic K-index reached a value of 5 at 08:26 UTC, covering the synoptic period from 06:00 to 09:00 UTC.

Potential impacts of this event primarily affect areas poleward of 60 degrees geomagnetic latitude. There may be weak power grid fluctuations, and minor impacts on satellite operations are possible. Auroras may be visible at high latitudes, including northern parts of the United States such as northern Michigan and Maine. The alert is based on the NOAA Space Weather Scale description at the G1 – Minor level.

According to the latest forecast discussion, solar wind conditions reflect the waning influence of a negative polarity coronal hole high-speed stream. Solar wind speeds remained elevated, though trending lower, and no Earth-directed coronal mass ejections (CMEs) have been observed in available imagery. The geomagnetic field has remained at quiet to active levels due to these lingering coronal hole high-speed stream effects.