Electron 2 MeV Integral Flux Alert issued on August 22

An alert was issued by NOAA SWPC on August 22, 2026, after the electron 2 MeV integral flux exceeded 1,000 pfu at geosynchronous orbit. This continued alert began on August 21 at 11:05 UTC and remains in effect. The maximum recorded 2 MeV electron flux was 1,062 pfu at 04:50 UTC on August 22.

High levels of electron flux, such as those reported, can impact satellite operations by increasing internal charging, potentially disrupting electronics and causing anomalies. Enhanced electron flux does not directly affect the general public, aviation, or ground-based systems, but satellite operators may need to take precautions to protect sensitive systems. According to the NOAA SWPC alert, these conditions are part of a continued event from the previous serial alert.

The elevated electron flux is expected to persist due to influences from a coronal hole high speed stream (CH HSS), as noted in the official NOAA SWPC forecast discussion. No significant Earth-directed solar flares or coronal mass ejections (CMEs) were observed during this period. The greater than 2 MeV electron flux is forecast to remain at high levels through August 24.