Electron 2 MeV flux alert issued on June 30, 2026

An Electron 2 MeV Integral Flux Alert was issued by NOAA’s Space Weather Prediction Center on June 30, 2026, at 04:59 UTC. The alert states that the 2 MeV integral electron flux has exceeded the 1,000 pfu threshold, continuing a sequence which began on June 26, 2026, at 13:45 UTC. The maximum measured value for June 29 reached 2,637 pfu.

Prolonged elevated electron flux such as this can pose increased risks to satellites and other spacecraft operating at geosynchronous orbit. Potential impacts include surface charging on spacecraft, which can result in temporary malfunctions or anomalies. There is no indication of increased energetic proton activity at this time, as the greater than 10 MeV proton flux remains at background levels.

According to NOAA’s latest forecast discussion, electron flux levels are expected to decrease to normal or moderate levels later on June 30 as a coronal mass ejection (CME) that left the Sun on June 26 reaches Earth. The continuation and duration of high flux conditions through much of June 30 depends on the precise timing of the CME’s arrival.