K-index 4 – Geomagnetic Activity Alert issued on April 10

A Geomagnetic K-index of 4 Alert was issued on April 10, 2026, with the threshold reached at 02:05 UTC for the synoptic period between 00:00 and 03:00 UTC. This alert is currently active and indicates elevated geomagnetic activity.

Potential impacts are expected primarily poleward of 65 degrees geomagnetic latitude. Weak power grid fluctuations may occur due to induced currents. Aurora may be visible at high latitudes, such as Canada and Alaska.

According to the forecast discussion issued by NOAA SWPC on April 10, 2026, enhancements in solar wind parameters are expected from April 10 to 12 due to the anticipated influence of a corotating interacting region (CIR) and the onset of a positive polarity coronal hole high speed stream (+CH HSS). The geomagnetic field is likely to reach G1 (Minor) storm levels on April 10 and 11.