G1 – Minor Geomagnetic Storm Alert issued on April 3

A G1 – Minor Geomagnetic Storm Alert was issued on April 3, 2026, after the Geomagnetic K-index reached a value of 5. The alert, issued at 21:41 UTC, is valid for the synoptic period from 21:00 UTC to 24:00 UTC. The event is currently classified at the G1 – Minor level according to the NOAA Scale, with an active warning in effect.

Potential impacts from this event include weak power grid fluctuations, minor effects on satellite operations, and increased visibility of aurora, primarily poleward of 60 degrees geomagnetic latitude. The aurora may be visible at high latitudes, such as in the northern tier of the United States, including regions like northern Michigan and Maine.

The current geomagnetic storm conditions are attributed to ongoing influences from a negative polarity coronal hole high speed stream (CH HSS) in the solar wind. Solar wind speeds increased to approximately 725 km/s during the period, contributing to the enhancement of geomagnetic activity. The NOAA Space Weather Prediction Center forecasts continued enhanced solar wind through April 5, with possible further geomagnetic disturbances as negative polarity CH HSS effects persist and a glancing blow from a coronal mass ejection (CME) that departed the Sun on April 1 may arrive late on April 3 or early April 4.