Electron flux alert issued on March 29, 2026

A continued alert for elevated electron 2 MeV integral flux was issued on March 29, 2026, by NOAA SWPC. The alert notes that the flux has exceeded 1,000 pfu, based on observations since March 22, 2026, with a recent maximum value of 1,596 pfu recorded on March 28. This alert follows a period of persistently high electron flux at geosynchronous orbit.

Potential impacts from this elevated electron flux include significant charging of satellite systems, which increases risk to onboard electronics and overall satellite reliability.

According to the latest forecast discussion from the SWPC, electron flux levels above 2 MeV have remained high but are expected to return to normal or moderate levels by March 30–31. No significant proton events or Earth-directed coronal mass ejections were observed, and the geomagnetic field displayed quiet to active levels.