Electron 2 MeV flux alert issued on June 27, 2026

An Electron 2 MeV Integral Flux Alert was issued on June 27, 2026 at 07:13 UTC after measurements indicated that the integral flux exceeded 1,000 pfu. The alert remains active as electron levels continue at high values, with the maximum flux recorded at 1,636 pfu on June 26, 2026 at 17:40 UTC. The alert began on June 26, 2026 at 13:45 UTC and is a continuation of a previously issued alert.

Elevated levels of 2 MeV electrons can pose increased radiation risks to satellites, particularly those in geosynchronous orbit. Such conditions may result in internal charging on spacecraft, increased background noise on instruments, and possible anomalies in satellite operation. According to current guidance, the greater than 2 MeV electron flux is expected to remain at moderate to high levels through June 29, 2026.

According to NOAA’s Space Weather Prediction Center, the high electron flux is associated with an elevated solar wind period driven by the influence of a negative polarity coronal hole high speed stream (CH HSS). The geomagnetic field has been at quiet to unsettled levels, and the solar wind speed declined from around 700 km/s to 650 km/s by the end of the observation period.