Electron 2 MeV Integral Flux Alert issued on March 28, 2026

An Electron 2 MeV Integral Flux Alert was issued on March 28, 2026, at 14:55 UTC, indicating that the 2 MeV electron flux at geosynchronous orbit has continued to exceed the threshold level of 1,000 pfu. This ongoing alert follows elevated electron fluxes since March 22, 2026. The maximum observed 2 MeV electron flux yesterday reached 12,785 pfu.

Potential impacts associated with this alert include significant charging of satellite systems, which can increase risk to satellite operations. Satellite operators are advised to monitor for possible anomalies resulting from the elevated electron environment. These conditions are evaluated according to NOAA SWPC’s alerting criteria for high-energy electrons at geosynchronous orbit.

According to the latest NOAA SWPC forecast discussion issued on March 28, 2026, the high electron flux is expected to persist through March 30. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 12,784 pfu at 27/1515 UTC, and such high levels are forecasted to continue in the coming days. The greater than 10 MeV proton flux remains at background levels.