Electron 2 MeV Integral Flux Alert issued on November 3

An Electron 2 MeV Integral Flux Alert was issued on November 3, 2025, after the integral electron flux exceeding 2 MeV surpassed 1,000 pfu. The alert, which is a continuation from October 31, 2025, reflects persistently high flux values, with a reported maximum of 12,611 pfu observed yesterday.

According to the alert, satellite systems may experience significant charging, resulting in increased risk to satellite operations. Elevated electron flux levels in the magnetosphere are known to enhance internal and surface charging of satellites, potentially impacting satellite electronics and function. Operators are advised to monitor systems closely during elevated flux periods.

The continuing elevated electron flux has been associated with high-speed solar wind streams and persistent high levels recorded over the past few days. The NOAA Space Weather Prediction Center’s latest discussion notes that the greater than 2 MeV electron flux reached a maximum of 10,260 pfu at 16:50 UTC on November 2, and is forecast to remain at moderate to high levels as high speed stream influence wanes.