Electron 2 MeV Integral Flux Alert issued on October 24

An Electron 2 MeV Integral Flux Alert was issued by the NOAA Space Weather Prediction Center on October 24, 2026, at 09:04 UTC. This continued alert indicates electron flux levels at geosynchronous orbit have exceeded 1,000 pfu, with the event ongoing since October 23, 2026, at 11:40 UTC. The maximum 2 MeV electron flux reached 3,169 pfu at 15:40 UTC on October 23, 2026.

Elevated electron flux can lead to increased charging of spacecraft surfaces and electronic components, particularly for satellites in geosynchronous orbit. This can result in anomalies or disruptions to spacecraft operations. The alert is in effect as long as the measured values remain above the threshold of 1,000 pfu at 2 MeV integral flux.

According to the latest forecast discussion from SWPC, the greater than 2 MeV electron flux reached high levels in the past 24 hours and is expected to remain elevated from October 24 to October 26. Solar activity has remained at low levels, with only low-level C-class flares observed and no new Earth-directed coronal mass ejections detected.