Electron 2 MeV Integral Flux Alert issued on April 5

An Electron 2 MeV Integral Flux Alert was issued on April 5, 2026, after measurements exceeded the threshold of 1,000 pfu. The elevated flux began on April 3, 2026, at 09:20 UTC, and the alert remains in effect according to NOAA’s Space Weather Prediction Center. The maximum flux reported yesterday was 2,419 pfu.

Potential impacts from this event include significant charging of satellite systems, which may increase the risk to satellite operations. Operators of satellite infrastructure are advised to monitor for any anomalies related to elevated electron flux conditions.

The high levels of energetic electrons coincided with a period of high solar activity, including several M-class flares produced by Region 4409, with the largest being an M7.5 flare at 01:17 UTC on April 4. The forecast indicates that the greater than 2 MeV electron flux is expected to remain at high levels through April 7, 2026.