G1 – Minor Geomagnetic Storm Alert issued on March 23, 2026

A G1 – Minor Geomagnetic Storm Alert was issued for March 23, 2026. The alert was triggered when the geomagnetic K-index reached 5 at 14:59 UTC. This alert is in effect for the synoptic period from 12:00 to 15:00 UTC.

According to NOAA SWPC, the primary area of impact is expected to be poleward of 60 degrees geomagnetic latitude. Potential impacts include weak power grid fluctuations, minor impacts to satellite operations, and possible visibility of aurora at high latitudes, such as the northern tier of the United States including northern Michigan and Maine.

SWPC’s forecast discussion attributes the ongoing geomagnetic activity mainly to the influence of a negative polarity coronal hole high speed stream (CH HSS). The solar wind environment remains enhanced, and periods of G1-G2 (Minor-Moderate) geomagnetic storming are expected on March 23 as CH HSS influences continue. These effects are predicted to gradually diminish starting March 24.