Electron flux alert issued on October 31, 2025

An alert for Electron 2 MeV Integral Flux exceeding 1,000 pfu was issued on October 31, 2025. According to NOAA’s Space Weather Prediction Center, the threshold was reached at 12:50 UTC and the alert was issued at 13:09 UTC, based on data from the GOES19 satellite.

The alert warns that satellite systems may experience significant charging, resulting in increased risk to satellite systems. Elevated electron flux levels can pose hazards to spacecraft operations and can increase the likelihood of surface charging-related anomalies.

According to the latest forecast discussion, the greater than 2 MeV electron flux is expected to reach moderate levels with a chance for high levels from October 31 to November 2, 2025, due to coronal hole high-speed solar wind streams. The greater than 10 MeV proton flux remains at background levels.