G1 – Minor Geomagnetic Storm Alert issued on June 5, 2026

A G1 – Minor Geomagnetic Storm Alert was issued on June 5, 2026, after the geomagnetic K-index reached 5 at 16:20 UTC. This alert, issued by the NOAA Space Weather Prediction Center, is active for the synoptic period from 15:00 UTC to 18:00 UTC and indicates the presence of minor geomagnetic storm conditions.

Potential impacts primarily affect areas poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations may occur, and there is the possibility of minor impacts to satellite operations. Auroras may be visible at high latitudes, including the northern tier of the United States such as northern Michigan and Maine. These effects are consistent with the official G1 – Minor geomagnetic storm classification.

This geomagnetic activity is linked to the arrival of multiple coronal mass ejections (CMEs) from June 3. Solar wind parameters heightened early on June 5, driving elevated and disturbed conditions and raising geomagnetic field thresholds. Geomagnetic storm conditions, including this G1 level alert, are expected to continue into June 6 before gradually subsiding.