ALERT: Geomagnetic K-index of 4 Alert issued on November 7

A Geomagnetic K-index of 4 Alert was issued by NOAA SWPC on November 7, 2026, at 19:20 UTC. The Alert is valid for the synoptic period from 18:00 to 21:00 UTC on the same day. This Alert indicates that geomagnetic conditions have reached active levels.

According to NOAA SWPC, areas primarily poleward of 65 degrees geomagnetic latitude may experience impacts. Potential effects include weak power grid fluctuations and the possibility of aurora being visible at high latitudes such as Canada and Alaska.

The event was triggered by enhanced solar wind conditions associated with the continued influence of a negative polarity coronal hole high speed stream (CH HSS). Solar wind speeds increased to a peak of 510 km/s, and total magnetic field strength reached 15 nT. These factors have contributed to the current geomagnetic activity levels.