Electron 2 MeV Integral Flux Alert issued on August 24

An Electron 2 MeV Integral Flux Alert was issued on August 24, 2026, by NOAA SWPC after electron flux values exceeded 1,000 pfu. The alert, serial number 3727, continues from an earlier announcement and indicates persistently high electron flux levels since August 21, 2026, at 11:05 UTC. The highest flux recorded yesterday reached 1,026 pfu at 10:30 UTC on August 24, 2026.

This alert signals elevated electron flux in geosynchronous orbit, which may pose an increased risk of surface charging to satellites and possible degradation of satellite operations. The ongoing alert reflects conditions above the standard threshold used to protect space-based assets and inform operators of potential anomalies related to high-energy electrons.

According to the latest Forecast Discussion issued by NOAA SWPC, solar activity has been at low levels with no Earth-directed coronal mass ejections observed. The high levels of greater than 2 MeV electron flux are expected to continue through August 26, 2026.