Physics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..333b&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 6, June 1992, p. 333-343.
Physics
3
Electron Acceleration, Plasma-Particle Interactions, Space Plasmas, Wave-Particle Interactions, Auroras, Bow Waves, Electron Distribution, Electrostatic Waves, Shock Waves
Scientific paper
The fundamentals of acceleration by electrostatic wave packets are discussed, and the constraints set by wave amplitude and by phase and group velocities are derived for electrostatic waves of the lower-hybrid type. A 1D Monte Carlo model demonstrates how an initial power-law velocity distribution can develop a peak when exposed to lower-hybrid turbulence. An assessment of the level of electrostatic turbulence needed to account for typical auroral electron velocity distributions is found to be consistent with the 'spiky' electric fields encountered in the acceleration region by Viking. The first results of a 2D Monte Carlo model demonstrate the essential field-aligned nature of the process. It is argued that the ion beams, sometimes forwarded as evidence for electron acceleration by potential differences, do not, in fact, support this hypothesis. The directionality of the acceleration and prospective energy sources are also discussed. Historical developments of the potential difference and wave theories are outlined.
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