Alert – Electron 2 MeV Integral Flux exceeded 1,000 pfu on November 11

An Alert for Electron 2 MeV Integral Flux exceeding 1,000 pfu was issued by the NOAA Space Weather Prediction Center on November 11, 2026 at 05:01 UTC. This alert continues from Serial Number 3771 and has been in effect since November 8, 2026 at 22:45 UTC. The maximum 2 MeV electron flux recorded yesterday reached 6,420 pfu at 15:50 UTC on November 10, 2026.

Elevated electron flux above 1,000 pfu can present increased risk to satellites operating in geosynchronous orbit. Such enhancements may lead to internal charging, which could impact satellite operations and communications. The alert serves as notification to operators and users of space-based assets to take necessary precautions during the period of elevated flux.

According to the latest forecast discussion issued by NOAA SWPC, the greater than 2 MeV electron flux reached high levels with a peak flux of 6,420 pfu observed at 10/1550 UTC. The elevated levels are likely to continue over November 11–13, 2026. There is also a slight chance for the greater than 10 MeV proton flux to exceed S1 – Minor levels over the same period.