Electron 2 MeV Integral Flux Alert issued on April 24

An Electron 2 MeV Integral Flux Alert was issued on April 24, 2026, after levels exceeded 1,000 pfu. This alert continues from April 19, 2026, highlighting persistently elevated electron flux at geosynchronous orbit. The maximum 2 MeV electron flux reached 3,446 pfu yesterday, indicating ongoing high electron environments in Earth’s outer radiation belt.

Satellite systems may be affected, as significant charging events can occur during such conditions. This increases the risk to satellite operations and onboard electronics, potentially impacting functionality due to internal and surface charging. These are known challenges during periods of enhanced radiation belt electron levels, which can lead to temporary anomalies or operational issues for satellites.

According to NOAA’s forecast discussion, the heightened electron flux is primarily associated with the influence of a weak positive polarity coronal hole high-speed stream (+CH HSS). The forecast anticipates moderate to high electron flux levels continuing through April 26, 2026, with transient suppressions possible on April 26 related to a glancing coronal mass ejection (CME) from Region 4420.