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

A G1 – Minor Geomagnetic Storm Alert was issued on March 23, 2026, after the geomagnetic K-index reached a threshold of 5 at 17:50 UTC. The alert covers the synoptic period from 15:00 to 18:00 UTC and is currently active, according to the NOAA Space Weather Prediction Center.

Potential impacts include weak power grid fluctuations, primarily poleward of 60 degrees geomagnetic latitude. Minor effects on satellite operations are possible, and aurora may be visible at high latitudes such as the northern tier of the United States, including northern Michigan and Maine.

This geomagnetic storm activity has been triggered by influences from 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 as the CH HSS continues to influence geospace on March 23.