Electron 2 MeV Integral Flux Alert issued on October 10

An alert for Electron 2 MeV Integral Flux exceeding 1,000 pfu was issued at 06:46 UTC on October 10, 2025. This continued alert follows ongoing elevated levels that began at 13:25 UTC on October 1, 2025. The maximum recorded 2 MeV electron flux yesterday reached 5,051 pfu.

According to the alert, satellite systems may experience significant charging, which increases the risk to satellite operations. These conditions are associated with enhanced energetic electron environments in Earth’s outer radiation belt, which can lead to anomalies or operational issues in spacecraft electronics.

NOAA SWPC reported that the greater than 2 MeV electron flux continued to reach high levels over the past 24 hours. Forecasts indicate that elevated electron flux is expected to persist at moderate levels through October 12. Proton flux remained at background levels. No significant changes in the solar wind or geomagnetic field were reported that could imminently end the enhanced conditions.