Physics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.5713b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, June 1, 1988, p. 5713-5725. DOE-supported research.
Physics
15
Auroral Zones, Electron Beams, Electron Radiation, Plasma Layers, Plasma-Particle Interactions, Atmospheric Stratification, Atmospheric Temperature, Magnetic Effects, Magnetohydrodynamic Stability, Particle In Cell Technique, Temperature Effects
Scientific paper
Using particle-in-cell simulations, test particle simulations, and analytic theory, the trajectories of electrons passing through magnetized plasma double layers (which may reside in the auroral zone) are examined, and the electron beams that emanate from the auroral zone double layers are characterized. It was found that the energetic electrons are strongly gyrophase-bunched, and the beams are very anisotropic in their own reference frame, with the high (about 25) perpendicular-to-parallel temperature ratios. The beams can be hollow in velocity space, with the hollowing pitch-angle being typically about 2 deg. Finally, the beams were found to have very steep gradients in parallel velocity. The disruption cycle of the beam-producing magnetized double layers was investigated, and it was found that substantial modulation of the electron beam occurs during the disruption periods.
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