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It is well established that high-energy (relativistic) electrons can cause deep dielectric charging of satellites, which can in turn lead to spacecraft upsets and/or complete satellite failures [Reagan et al, 1983; Baker et al, 1987].
Electron Events can persist for days, but the flux values observed at geosynchronous orbit follow a strong diurnal cycle due to the geometry of the Earth’s magnetic field. Maximum values generally occur near local noon locations on the daytime side of the Earth. ALERTS for Electron Events are therefore issued once per "satellite day" based on data from SWPC's primary GOES satellite, when electron fluxes have exceeded the event threshold (1000 pfu).