High electron flux alert issued on March 23, 2026

An official alert has been issued by NOAA’s Space Weather Prediction Center on March 23, 2026, after the Electron 2 MeV Integral Flux exceeded 1,000 pfu at geosynchronous orbit. The alert, issued at 12:01 UTC, continues from an earlier alert that began at 14:30 UTC on March 22. The maximum 2 MeV electron flux recorded yesterday was 1,321 pfu.

According to the alert, satellite systems may experience significant charging, resulting in increased risk to satellite operations. This elevated electron flux level can cause satellite anomalies due to surface charging and high-energy particle penetration, which are recognized risks during such space weather events.

The high electron flux event follows recent geomagnetic activity associated with the onset of high-speed solar wind streams. The latest forecast discussion confirms that electrons greater than 2 MeV at geosynchronous orbit reached elevated levels following the onset of these streams and geomagnetic disturbances. The greater than 2 MeV electron flux is expected to remain at high levels through March 25, 2026, as post-storming effects continue.