Electron 2 MeV Integral Flux Alert issued on September 26

An Electron 2 MeV Integral Flux Alert was issued on September 26, 2026, after flux readings exceeded the 1,000 pfu threshold at 15:35 UTC, as detected by the GOES-19 satellite. The alert was officially released by NOAA’s Space Weather Prediction Center at 15:51 UTC.

This alert is triggered when high-energy electron flux exceeds the specified threshold, indicating elevated space weather conditions. Such increases in electron flux can potentially affect spacecraft operations in geosynchronous orbit by enhancing charging risks to satellite systems.

According to the latest forecast discussion, the greater than 2 MeV electron flux was at normal to moderate levels during the previous 24 hours and is expected to increase to high levels on September 27–28, 2026. No Earth-directed coronal mass ejections or significant events were observed during this period.