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

A G1 – Minor Geomagnetic Storm Alert was issued on June 5, 2026, following the geomagnetic K-index reaching a value of 5 at 13:27 UTC. The alert is valid during the synoptic period from 12:00 to 15:00 UTC. This alert signals minor geomagnetic storm conditions according to the NOAA Space Weather Scale, with the active warning currently in effect.

Potential impacts from this G1 – Minor Geomagnetic Storm are expected primarily poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations can occur due to induced currents, and minor impacts on satellite operations are possible. Additionally, auroras may be visible at high latitudes, including the northern tier of the United States such as northern Michigan and Maine.

This geomagnetic disturbance was triggered by escalated solar wind parameters associated with the arrival of multiple coronal mass ejections (CMEs) launched on June 3, 2026. Solar wind speeds increased sharply and magnetic field enhancements were observed beginning at 04:24 UTC on June 5. Elevated and disturbed solar wind conditions are expected to persist through the remainder of June 5 before gradually returning to background levels by June 7, 2026.