Electron 2 MeV Integral Flux Alert issued on October 16

An Electron 2 MeV Integral Flux Alert was issued on October 16, 2026. The alert was triggered when the electron integral flux at energies greater than 2 MeV exceeded 1,000 pfu, as observed at 13:45 UTC by the GOES-19 satellite. The alert was officially issued by NOAA SWPC at 14:19 UTC on the same day.

Electron flux alerts indicate elevated levels of high-energy electrons in Earth’s outer radiation belt, monitored for potential risk to spacecraft operations and satellite systems. Levels above 1,000 pfu can increase the risk of spacecraft surface charging and anomaly rates in satellites in geosynchronous orbit. There is no direct impact from these electron flux levels on terrestrial systems or the general public.

According to the most recent NOAA SWPC forecast discussion, the electron fluxes were at normal to moderate levels prior to the event, with only a slight chance for a minor solar radiation storm. No Earth-directed coronal mass ejections (CMEs) were observed, and overall solar activity was low with the largest flare being a C4.9 event from solar region 4551 at 15:55 UTC on October 15, 2026.