Auroral kilometric radiation from transpolar arcs

Physics

Scientific paper

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Auroral Arcs, Ion Beams, Kilometric Waves, Ultraviolet Spectra, Viking Spacecraft, Auroral Zones, Cold Plasmas, Electrostatic Waves, High Frequencies

Scientific paper

The relationship between auroral kilometric radiation (AKR) and discrete auroral features is studied with satellite observations. AKR generation is most often associated with nightside aurora, but under certain circumstances the source regions may also occur on discrete features identified as transpolar arcs. The wave spectrograms detected during crossings or closest approaches to such sources exhibit structures similar to those observed during nightside AKR source crossings. Also, the associated ion beams and trapped conical electron populations with enhanced upward directed loss cones peak at comparable energies.

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