Electron 2 MeV Integral Flux Alert issued on October 9

An alert for Electron 2 MeV Integral Flux exceeding 1,000 pfu was issued by NOAA’s Space Weather Prediction Center on October 9, 2025, at 14:03 UTC. This continued alert has been in effect since October 1, 2025, and the maximum 2 MeV electron flux measured yesterday reached 4,767 pfu.

Satellite systems may experience significant charging during this event, increasing the risk to satellite operations in the affected regions. Operators are advised to monitor their systems closely due to the elevated risk caused by high electron flux levels.

According to the official forecast discussion, the greater than 2 MeV electron flux continued to reach high levels over the past 24 hours and is expected to remain at moderate levels through October 11, 2025. The proton flux remains at background levels and no significant solar flare or proton event triggered this alert.