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It has long been known that the magnetospheric particles can precipitate into the atmosphere of the Earth. In this paper\udwe examine such precipitation of energetic electrons using the data obtained from low-altitude polar orbiting satellite\udobservations. We analyze the precipitating electron flux data for many periods selected from a total of 84 storm events\udidentified for 2001-2012. The analysis includes the dependence of precipitation on the Kp index and the electron energy, for\udwhich we use three energies E1 > 30 keV, E2 > 100 keV, E3 > 300 keV. We find that the precipitation is best correlated with Kp\udafter a time delay of < 3 hours. Most importantly, the correlation with Kp is notably tighter for lower energy than for higher\udenergy in the sense that the lower energy precipitation flux increases more rapidly with Kp than does the higher energy\udprecipitation flux. Based on this we suggest that the Kp index reflects excitation of a wave that is responsible for scattering of\udpreferably lower energy electrons. The role of waves of other types should become increasingly important for higher energy,\udfor which we suggest to rely on other indicators than Kp if one can identify such an indicator

Dependence of Energetic Electron Precipitation on the Geomagnetic Index Kp and Electron Energy