Electron 2 MeV Integral Flux Alert issued on April 16, 2026

An Electron 2 MeV Integral Flux Alert was issued on April 16, 2026, after flux levels exceeded 1,000 pfu at geosynchronous orbit. This alert continues an ongoing event that began on April 3, 2026 at 09:20 UTC. The maximum observed 2 MeV electron flux for the previous day was 3,248 pfu. The alert was issued by the NOAA Space Weather Prediction Center and remains in effect as high flux levels persist.

Potential impacts of this event include significant charging of satellite systems, which can increase the risk to satellite operations. Elevated electron flux conditions like these are monitored closely due to their potential to affect satellite functionality, including anomalies or disruptions, particularly in geosynchronous orbit.

According to the latest NOAA SWPC forecast discussion issued on April 16, 2026, the electron flux greater than 2 MeV is expected to remain at high levels through April 17, before briefly dropping to moderate levels on April 18 with the predicted arrival of a coronal hole high speed stream. The greater than 10 MeV proton flux remains at background levels.