Electron flux alert issued on May 19, 2026

An electron flux alert was issued on May 19, 2026, after the electron integral flux at energies greater than 2 MeV exceeded 1,000 pfu at geosynchronous orbit. According to the alert, the elevated electron flux levels began on May 16, 2026 at 17:40 UTC and have continued above the threshold through May 19, 2026. The highest daily value recorded yesterday was 6,118 pfu.

The continued elevated electron flux at geosynchronous orbit can pose increased risks to spacecraft and satellite operations. Exposure to high electron flux levels can lead to deep dielectric charging events and possible hardware anomalies in susceptible satellites. Operators are advised to consider these conditions in their planning and operations until flux levels decrease.

Space weather forecasters note that the high electron flux is due to waning influences from a negative polarity coronal hole high-speed stream. The forecast discussion indicates that the greater than 2 MeV electron flux is expected to decrease to normal or moderate levels by May 19–20 as high-speed stream effects subside.