Electron 2 MeV integral flux alert issued on October 7

A continued alert for Electron 2 MeV Integral Flux exceeding 1,000 pfu has been issued by the NOAA Space Weather Prediction Center as of October 7, 2026, at 05:04 UTC. The alert reports that the threshold was first exceeded on October 5, 2026, at 18:30 UTC, with a peak flux of 11,000 pfu recorded on October 6 at 15:55 UTC. The maximum observed flux for the previous day was 10,956 pfu.

This alert indicates that high levels of energetic electrons are present in the Earth’s outer radiation belt. Such conditions can pose an increased risk to spacecraft operations, including potential charging effects on satellites and possible anomalies in satellite components. The event falls within the criteria for heightened electron flux conditions as monitored by NOAA SWPC.

According to the latest forecast discussion, these elevated electron fluxes are expected to persist through October 9, 2026. The current event is not associated with any significantly elevated proton fluxes, which remain at background levels. There is only a slight (10%) chance for a greater than 10 MeV proton event reaching the S1 – Minor threshold during this period.