Morning sector electron precipitation events observed by incoherent scatter radar

Physics

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Auroral Zones, Electron Precipitation, Incoherent Scatter Radar, Absorption Spectra, Electromagnetic Absorption, Electron Density Profiles, Electron Energy, Morning

Scientific paper

Two auroral zone electron precipitation events in the morning sector have been studied in detail using the UHF incoherent scatter radar in northern Scandinavia. The electron density profiles are interpreted in terms of the incoming spectrum of energetic electron, and it is shown that the spectrum is most energetic at the maximum of the event and softens subsequently. The observations cannot be explained by simple gradient-curvature drift of trapped electrons. It is shown, further, that events appearing to be fresh substorms in magnetometer and riometer data may be no more than intensifications of continuing activity. During a pulsation event the incoming electron spectrum was modulated in energy as well as in intensity. The height and thickness of the resulting radio-absorption layers are derived.

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