Electron Flux Alert issued on November 4, 2025

An Electron 2 MeV Integral Flux Alert was issued on November 4, 2025, at 05:51 UTC, following observations that electron flux levels exceeded the 1,000 pfu threshold. This continued alert, originally initiated on October 31, 2025, at 12:50 UTC, indicates that elevated electron flux levels persist, with a reported maximum of 6,364 pfu on November 3, 2025.

According to the official alert, satellite systems may experience significant charging during periods of high electron flux. This condition increases risks to satellite infrastructure due to enhanced surface and internal charging events, which can affect satellite operations and reliability.

Data from the NOAA Space Weather Prediction Center indicate that the ongoing elevated electron flux is primarily due to continued influence from a coronal hole high speed stream (HSS), which has kept the greater than 2 MeV electron flux mostly above the 1,000 pfu threshold. The most recent measurements reached a peak flux of 2,660 pfu on November 3, 2025, as recorded by the GOES-19 satellite. The greater than 2 MeV electron flux is expected to remain at moderate to high levels in the coming days as the influence of the high speed stream wanes.