High electron flux alert issued on June 6, 2026

A high electron flux alert was issued on June 6, 2026, after the 2 MeV electron integral flux exceeded 1,000 pfu. The threshold was reached at 16:40 UTC, and the alert was announced at 16:55 UTC by the NOAA Space Weather Prediction Center (SWPC). The previous day’s maximum value was 536 pfu.

Elevated high-energy electron flux levels can impact spacecraft operations, particularly satellite electronics in geosynchronous orbit, potentially increasing the risk of surface charging and related anomalies. The alert was based on real-time observations from the GOES-19 satellite, which detected electron flux levels surpassing the established alert threshold. The electron integral flux at energies greater than 2 MeV remaining above 1,000 pfu indicates significantly increased space weather activity in the environment near Earth.

The increase in electron flux was anticipated in the latest SWPC forecast discussion, which indicated that the greater than 2 MeV electron flux at geosynchronous orbit was expected to rise to high levels on June 6 due to recent CME effects, and remain elevated through June 8. No Earth-directed coronal mass ejections (CMEs) were observed, but lingering influences from previous activity were expected to contribute to disturbed space weather conditions during this period.