Electron 2 MeV Integral Flux Alert issued on May 20, 2026

An Electron 2 MeV Integral Flux Alert was issued on May 20, 2026, following a continued period where the electron flux at geosynchronous orbit exceeded 1,000 pfu. The alert is ongoing, with the exceedance first beginning on May 16, 2026 at 17:40 UTC. The maximum measured 2 MeV electron flux as of yesterday reached 2,860 pfu, indicating prolonged elevated levels.

These elevated electron flux conditions at geosynchronous orbit present increased risk primarily for satellite operators. Such prolonged periods of high-energy electron enhancements can cause internal charging in spacecraft, potentially impacting satellite operations and increasing the likelihood of anomalies. The alert remains in effect as electron flux values continue to exceed threshold levels set by NOAA SWPC for geospace monitoring.

According to the latest NOAA SWPC forecast discussion issued on May 20, 2026, the high flux levels are expected to return to normal or moderate values through May 21 as current geomagnetic conditions subside. A subsequent increase to high flux is anticipated around May 22 due to the onset of a new coronal hole high-speed stream. The proton flux remains at background levels, and no Earth-directed coronal mass ejections have been reported during the period.