Electron Flux Alert issued on December 22

An Electron 2 MeV Integral Flux Alert was issued on December 22, 2025, at 15:00 UTC, after electron flux levels exceeded 1,000 pfu. This continued alert, which began on December 21, 2025, at 14:25 UTC, reports a maximum 2 MeV electron flux of 1,566 pfu observed yesterday. The alert remains in effect, with high levels of energetic electrons detected.

Satellite systems may experience significant charging during these elevated flux conditions, resulting in an increased risk to satellite operations and potential anomalies. This heightened risk stems from the impact of energetic electrons in the outer magnetosphere, which can accumulate on satellite surfaces and electronics, occasionally causing disruptions.

According to the latest discussion from NOAA SWPC, the greater than 2 MeV electron flux reached high levels with a peak of 1,570 pfu. The forecast expects electron flux to return to normal to moderate levels on December 22 and 23, with high levels likely again on December 24.