G1 – Minor Geomagnetic Storm Alert issued on July 6

A G1 – Minor Geomagnetic Storm Alert was issued on July 6, 2025. The alert indicates a geomagnetic K-index of 5 was reached at 05:38 UTC, with the synoptic period covering 03:00 to 06:00 UTC. The alert remains active as of the latest issuance at 05:39 UTC.

The primary area of impact is expected poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations are possible, and minor impacts on satellite operations may be experienced. Additionally, auroras may be visible at high latitudes, including regions such as northern Michigan and Maine. These conditions are consistent with the NOAA G1 – Minor classification for geomagnetic storms.

The event was triggered by the influence of a negative polarity coronal hole, as reflected in elevated solar wind speeds and an active geomagnetic field. The total magnetic field strength varied between 5 and 14 nT, with solar wind speeds reaching up to approximately 485 km/s. No Earth-directed coronal mass ejections were observed in available imagery.