Electron Flux Alert issued on June 16, 2026

An Electron 2 MeV Integral Flux Alert was issued at 11:24 UTC on June 16, 2026, by the NOAA Space Weather Prediction Center. According to the continued alert, electron flux levels exceeded the 1,000 pfu threshold, with this elevated state persisting since 13:32 UTC on June 13, 2026. The maximum measured electron flux for June 15 was 1,489 pfu.

Elevated electron fluxes can pose increased risks to spacecraft and their electronic components, particularly satellites and space-borne instruments in geosynchronous orbit. Sustained high electron levels may result in deep dielectric charging on spacecraft surfaces, which in turn can lead to operational anomalies or hardware failures during the period of enhancement.

The latest forecast discussion from NOAA’s Space Weather Prediction Center confirms that the greater than 2 MeV electron flux reached high levels, with a peak value of 1,488 pfu observed at 17:40 UTC on June 15. The electron flux is expected to remain at high levels through June 17 and decrease to moderate levels by June 18, 2026. Proton flux remains at background levels. No significant Earth-directed solar flares or coronal mass ejections were observed during this period.