Electron 2 MeV Integral Flux Alert issued on December 21
An Electron 2 MeV Integral Flux Alert was issued for December 21, 2025, after flux levels exceeded 1,000 pfu at 14:25 UTC, as measured by GOES19. The alert was released by NOAA’s Space Weather Prediction Center at 14:45 UTC on the same day.
Potential impacts from this event include significant charging of satellite systems, which can result in increased risk to satellite operations. Elevated electron flux environments are known to potentially cause surface and internal charging on spacecraft, increasing the chance of anomalies or disruptions.
According to the latest SWPC forecast discussion, the greater than 2 MeV electron flux reached a peak of 7,320 pfu. The flux levels are expected to return to normal to moderate levels from December 21 to 23, 2025. The proton flux remains at background levels.
For detailed, up-to-the-minute conditions, visit our real-time space weather monitoring platform at watchers.news/swx.