G2 – Moderate Geomagnetic Storm Alert issued on June 5, 2026

A G2 – Moderate Geomagnetic Storm Alert was issued at 16:39 UTC on June 5, 2026, after the geomagnetic K-index reached a value of 6 at 16:38 UTC. This alert remains active for the synoptic period from 15:00 UTC to 18:00 UTC. The event is classified on the NOAA scale as G2 – Moderate.

Potential impacts of this geomagnetic storm include effects primarily poleward of 55 degrees geomagnetic latitude. There is the possibility of power grid fluctuations, especially in high-latitude regions where voltage alarms may occur. Satellite operations may experience orientation irregularities and low Earth-orbit satellites could encounter increased atmospheric drag. High-frequency (HF) radio propagation could suffer from signal fading at higher latitudes, and auroras may be seen as far south as New York, Wisconsin, and Washington state.

According to the NOAA Space Weather Prediction Center’s latest forecast discussion, this storm was triggered by the arrival of multiple coronal mass ejections (CMEs) that were launched on June 3. These events have caused significant enhancements in solar wind parameters, driving geomagnetic storm activity to G2 – Moderate levels, with the potential for even stronger conditions later in the day. Conditions are expected to remain disturbed through June 6 before gradually returning to background levels by June 7, 2026.