Electron 2 MeV Integral Flux Alert issued on June 7

An alert for electron 2 MeV integral flux exceeding 1,000 pfu was issued on June 7, 2026. The alert was released by NOAA’s Space Weather Prediction Center at 11:46 UTC after the threshold was reached at 11:43 UTC. The GOES-18 satellite recorded a maximum value of 1,284 pfu on the previous day, indicating persistently high electron flux levels at geosynchronous orbit.

High fluxes of energetic electrons in this range can increase the risk of charging on satellite surfaces, which may impact spacecraft operations or lead to minor anomalies. These conditions are routinely monitored as they may also affect radio communications and the performance of satellite-based systems, especially those operating in the affected energy ranges.

According to the latest forecast discussion, the greater than 2 MeV electron flux is expected to remain at high levels through June 7 before returning to normal to moderate levels on June 8 as the effects of a coronal mass ejection (CME) arriving from June 6 begin to take hold. Electron fluxes are likely to rise again by the end of June 9. The alert reflects ongoing elevated electron flux associated with recent solar activity, but no immediate proton event has been detected.