Electron 2 MeV flux alert issued on September 28, 2026

An alert for Electron 2 MeV Integral Flux exceeding 1,000 pfu was issued by NOAA SWPC on September 28, 2026, at 05:00 UTC. This continued alert follows sustained elevated electron flux levels first noted on September 26, 2026, at 15:35 UTC. The maximum recorded 2 MeV electron flux reached 3,060 pfu on September 27, 2026, at 17:20 UTC.

High electron fluxes at geosynchronous orbit can increase the risk of internal charging on satellites, potentially impacting satellite operations and increasing the probability of anomalies. Such conditions may require enhanced monitoring by satellite operators, but do not directly impact ground-based systems.

According to the latest forecast discussion from NOAA SWPC, the greater than 2 MeV electron flux is expected to continue at high levels from September 28–30, 2026. No significant solar flares or Earth-directed coronal mass ejections (CMEs) have been detected as the cause, and solar wind conditions have returned to ambient levels following earlier coronal hole high-speed stream influences.