Electron 2 MeV integral flux alert issued on June 29

An alert has been issued by the NOAA Space Weather Prediction Center stating that the electron 2 MeV integral flux has exceeded 1,000 pfu. The alert was first issued on June 26, 2026 at 13:45 UTC and continues as of June 29, 2026, with a maximum 2 MeV electron flux of 2,637 pfu observed on June 28, 2026 at 17:00 UTC.

This alert indicates that electron fluxes in the outer radiation belt are at high levels. Elevated electron fluxes may pose risks to satellite operations, potentially causing spacecraft charging and increased background noise in electronic systems. The warning remains active as long as the flux exceeds the 1,000 pfu threshold.

According to the latest space weather forecast discussion from NOAA SWPC, the greater than 2 MeV electron flux is expected to remain elevated at moderate to high levels through July 1, 2026, while the proton flux remains at background levels. No significant Earth-directed solar phenomena have been associated with this elevated flux at this time.