Electron 2 MeV Integral Flux Alert issued on October 28

An Electron 2 MeV Integral Flux Alert was issued on October 28, 2026, following observations that the flux levels exceeded the threshold of 1,000 pfu. This continued alert, which began on October 23, 2026, remains in effect after a peak of 1,789 pfu was recorded at 17:15 UTC on October 27, 2026.

The alert indicates that high electron flux conditions persist, which can increase the risk of internal charging of satellites and spacecraft operating in geosynchronous orbits. Prolonged exposure to elevated electron levels may lead to anomalies or operational impacts for affected satellite systems. According to the official data, the 2 MeV electron integral flux exceeded 1,000 pfu over a sustained period, prompting the continued alert status.

The triggering event for this elevated electron flux flows from recent space weather conditions. While solar activity remained at low levels, the forecast discussion notes that the greater than 2 MeV electron flux reached high levels, peaking at 1,790 pfu on October 27, 2026. The proton flux remained at background levels, and overall solar wind conditions were nominal, suggesting that electron flux imbalances rather than a major solar event are responsible for the alert.