G1 – Minor Geomagnetic Storm Alert issued on April 4, 2026

A G1 – Minor Geomagnetic Storm Alert was issued on April 4, 2026, after the geomagnetic K-index reached a value of 5 at 02:48 UTC. The alert is active during the synoptic period from 00:00 to 03:00 UTC, as announced by the NOAA Space Weather Prediction Center.

According to the issued alert, the primary areas of impact are those poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations are possible due to induced currents. In addition, minor impacts on satellite operations may occur, and auroras may become visible at high latitudes, such as the northern tier of the United States, including northern Michigan and Maine.

The current geomagnetic disturbance is attributed to the combined effects of a coronal mass ejection (CME) that left the Sun on April 1 and the influence of a negative polarity coronal hole high-speed stream (CH HSS). Solar wind parameters remain enhanced, supporting the likelihood of G1 – Minor to G2 – Moderate geomagnetic storm levels through April 4, 2026, before conditions gradually subside.