Electron 2 MeV Integral Flux Alert issued on September 9, 2026

An Electron 2 MeV Integral Flux Alert was issued on September 9, 2026, after observed integral flux levels of electrons at energies greater than 2 MeV surpassed the 1,000 pfu threshold. According to NOAA’s Space Weather Prediction Center, this alert continues with Serial Number 3738 and marks sustained elevated electron flux beginning at 15:50 UTC on September 8, 2026. The highest 2 MeV electron flux observed yesterday was 1,003 pfu.

High electron flux events in Earth’s outer radiation belt can pose increased risks to satellites in geostationary orbit due to enhanced charge accumulation, potentially leading to surface charging and degradation of satellite components. These alerts help operators take preventive actions to reduce risks to spacecraft health and operations.

Space weather forecasters reported that high electron flux levels were observed with a peak of 2,780 pfu at 17:10 UTC on September 8. The current energetic particle environment is linked to ongoing coronal hole high speed stream influences. The forecast expects moderate to high electron flux levels to persist, with brief returns to normal or moderate levels possible during anticipated CME arrivals.