Electron distribution function behavior during localized transverse ion acceleration events in the topside auroral zone

Details Electron distribution function behavior during localized transverse ion acceleration events in the topside auroral zone Electron distribution function behavior during localized transverse ion acceleration events in the topside auroral zone

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.2227l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A2, p. 2227-2241

Computer Science

Sound

35

Auroral Zones, Distribution Functions, Electron Beams, Electron Distribution, Electron Energy, Particle Acceleration, Atmospheric Sounding, Field Aligned Currents, Hiss, Landau Damping, Transverse Acceleration

Scientific paper

The Topaz3 auroral sounding rocket made the following observations concerning the transfer of precipitating auroral electron energy to transverse ion acceleration in the topside auroral zone. During the course of the flight, the precipitating electron beam was modified to varying degrees by interaction with VLF hiss, at times changing the beam into a field-aligned plateau. The electron distribution functions throughout the flight are classified according to the extent of this modification, and correspondences with ion acceleration events are sought. The hiss power during most of this rocket flight apparently exceeded the threshold for collapse into solitary structures. At the times of plateaued electron distributions, the collapse of these structures was limited by Landau damping through the ambient ions, resulting in a velocity-dependent acceleration of both protons and oxygen. This initial acceleration is sufficient to supply the number flux of upflowing ions observed at satellite altitudes. The bursty ion acceleration was anticorrelated, on 1-s or smaller timescales, with dispersive bursts of precipitating field-aligned electrons, although on longer timescales the bursty ions and the bursty electrons are correlated.

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