Elevated electron flux alert issued on October 16, 2025

An Electron 2 MeV Integral Flux Alert was issued on October 16, 2025, after flux levels exceeded the 1,000 pfu threshold. This continued alert extends from an event that began on October 1, 2025, at 13:25 UTC. The maximum observed 2 MeV electron flux reported for October 15 was 2,847 pfu.

According to the alert, satellite systems may experience significant charging, resulting in increased risk to satellite operations. When electron fluxes reach high levels, charged particles can accumulate on spacecraft surfaces and components, potentially causing electrical anomalies or operational issues.

Forecast discussions from the NOAA Space Weather Prediction Center indicate that the recent elevated electron flux is linked to ongoing space weather activity. High levels of greater than 2 MeV electrons were observed, with levels expected to decrease on October 16 as CME arrivals occur and potentially rebound to moderate or high on October 17 to 18, 2025.