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Using the data from satellite CRRES and threegeostationary LANL spacecraft, the propagation of an electron cloud frommidnight to the evening sector is investigated. An electron cloud wasinjected during a weak isolated substorm that developed on a quietgeomagnetic background. It is found that within the local time sector from03:00 until at least 08:00 MLT, the propagation of electrons at perpendicularpitch-angles is well described by a simple model of drift in the dipolemagnetic field. The flux levels in the field-aligned electrons increasesimultaneously with the flux at perpendicular pitch angles, which isattributed to the pitch angle diffusion by the whistler mode. This pitch-anglediffusion leads to precipitation of electrons from a drifting cloud and anincrease in the ionospheric electron density, simultaneously observed aboveTromsø, Norway, by the EISCAT UHF radar in the morning sector(04:40–05:25 MLT). The precipitation develops as quasi-periodic pulses with a period ofabout 100 s. We discuss the models of pulsating precipitation due to thewhistler cyclotron instability and show that our observations can beexplained by such a model

Longitudinal drift of substorm electrons as the reason of impulsive precipitation events and VLF emissions