ALERT: Geomagnetic K-index of 4 Alert issued on March 25, 2026

A Geomagnetic K-index of 4 Alert was issued on March 25, 2026, following the threshold being reached at 08:05 UTC. The Alert covers the synoptic period from 06:00 to 09:00 UTC. The warning is active and was formally issued by the NOAA Space Weather Prediction Center.

Potential impacts from this level of geomagnetic activity primarily affect areas poleward of 65 degrees geomagnetic latitude. Weak power grid fluctuations are possible at these locations. Additionally, auroras may be visible at high latitudes, including regions such as Canada and Alaska.

According to the latest forecast discussion, the geomagnetic field was at quiet to active levels under the influence of a waning negative polarity coronal hole high-speed solar wind stream. No Earth-directed coronal mass ejections (CMEs) were observed in recent imagery, and solar activity remained at low levels. The forecast indicates mildly enhanced solar wind conditions are expected to persist through March 26, 2026, as the coronal hole effects gradually wane.