Electron 2 MeV Integral Flux Alert issued on September 8, 2026

An Electron 2 MeV Integral Flux Alert was issued on September 8, 2026. The alert was triggered after the electron flux exceeded 1,000 pfu, with the threshold reached at 15:50 UTC. The alert was based on data collected by the GOES-19 satellite and issued by the NOAA Space Weather Prediction Center at 16:08 UTC.

This alert points to elevated high-energy electron levels measured in the geosynchronous orbit. For context, the alert specifies that the previous day’s maximum was significantly lower, at 373 pfu, indicating a substantial increase. Such electron flux enhancements can pose a risk to satellites by causing charging issues and potential harm to onboard systems and sensors. Alerts of this type are important for operators of satellite operations and related technology infrastructure.

According to the latest official forecast discussion issued on September 8, 2026, the greater than 2 MeV electron flux had recently returned to moderate levels, but further increases were anticipated after the arrival of coronal mass ejections (CMEs) expected around September 10. The summary also notes continued enhanced solar wind conditions from a positive polarity coronal hole high-speed stream, with further enhancements due to expected CME arrivals. There was no specific major solar flare identified as the direct cause of this electron alert in the current forecast discussion.