Electron 2 MeV Integral Flux Alert issued on December 17

An alert has been issued for Electron 2 MeV Integral Flux exceeding 1,000 pfu on December 17, 2025. The threshold was reached at 14:05 UTC and the alert was issued at 15:06 UTC, based on observations from the GOES19 satellite.

Potential impacts noted in the alert indicate that satellite systems may experience significant charging, which results in increased risk to satellite operations. These high flux levels can raise the possibility of damage or operational issues for satellites in affected regions.

The NOAA Space Weather Prediction Center reported that, over the past 24 hours, the greater than 2 MeV electron flux briefly reached high levels, with a peak flux of 1,020 pfu recorded. Solar activity remained low with only low-level C-class flares observed and no Earth-directed coronal mass ejections (CMEs). The high electron flux levels are being influenced by high-speed solar wind streams from a negative polarity coronal hole.