Electron 2 MeV Flux Alert issued on September 9, 2026

An Electron 2 MeV Integral Flux Alert was issued on September 9, 2026, at 05:35 UTC. This alert follows ongoing elevated electron flux levels, with the alert period beginning on September 8, 2026, at 15:50 UTC. Reported values included a maximum 2 MeV flux of 1,540 pfu recorded at 01:45 UTC on September 9, with the peak 24-hour flux reaching 2,780 pfu observed at 17:10 UTC on September 8.

When electron flux at geosynchronous orbit exceeds 1,000 pfu at energies greater than 2 MeV, satellite operations may be affected by deep dielectric charging, and there is potential for minor satellite anomalies. These events do not present direct impacts to ground-based systems but are closely monitored due to their influence on satellite operations.

The elevated electron flux was observed alongside active solar wind conditions attributed to a positive polarity coronal hole high speed stream (CH HSS), which has been influencing space weather activity. While there were isolated C-class solar flares, no major solar flares or significant coronal mass ejection impacts were directly linked to this alert. The greater than 2 MeV electron flux levels are forecast to remain at moderate to high levels through October 11, 2026.