ALERT: Geomagnetic K-index of 4 Alert issued on June 30

A Geomagnetic K-index of 4 Alert was issued at 17:11 UTC on June 30, 2026. The alert is active for the synoptic period from 15:00 to 18:00 UTC. This alert signifies that geomagnetic conditions have reached the threshold for a K-index of 4, indicating increased geomagnetic activity.

According to the official alert, the area of impact is primarily poleward of 65 degrees geomagnetic latitude. Potential impacts include weak power grid fluctuations and the possibility of aurora being visible at high latitudes, such as Canada and Alaska.

The current geomagnetic disturbance is likely related to the arrival of a coronal mass ejection (CME) that left the Sun on June 26 or June 27, 2026. The NOAA Space Weather Prediction Center forecast indicates that a disturbed solar wind environment from these CME events is influencing Earth’s magnetosphere, with an expected decrease in activity after July 2, 2026.