Electron 2 MeV flux alert issued on October 17, 2025

An alert for Electron 2 MeV Integral Flux exceeding 1,000 pfu was issued on October 17, 2025, at 11:22 UTC by NOAA’s Space Weather Prediction Center. This continued alert first began on October 1, 2025, at 13:25 UTC, and reports confirm that the previous day’s maximum 2 MeV flux reached 3,769 pfu.

According to the alert, satellite systems may experience significant charging, leading to increased risks for satellite operations. These elevated electron flux levels can result in surface charging of satellites, which may cause malfunctions or disruptions to onboard electronics, posing additional operational concerns.

Forecast data indicates that the greater than 2 MeV electron flux reached high levels over the past 24 hours, hitting a maximum of 3,769 pfu at 20:15 UTC on October 16, 2025. The forecast also expects electron flux levels to decrease to normal to moderate on October 17 due to glancing effects from recent coronal mass ejections (CMEs), before potentially returning to high levels on October 18 and 19. Proton flux levels remain at background values, with only a slight chance for further radiation storm activity through October 18.