Auroral electron beams - Stability and acceleration

Details Auroral electron beams - Stability and acceleration Auroral electron beams - Stability and acceleration

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.7577k&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 1, 1981, p. 7577-7585.

Computer Science

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16

Auroral Zones, Electron Acceleration, Electron Beams, High Energy Electrons, Magnetohydrodynamic Stability, Rocket Sounding, Auroral Arcs, Electron Distribution, Electrostatic Waves, Velocity Distribution, Whistlers

Scientific paper

The paper considers the stability and acceleration of the high-energy electron beams identified at the outer edges of auroral electron distribution functions, and the low-energy electron beams identified within broad electron distributions near the edges of auroral arcs. From an analysis of the growth rates and lengths of electrostatic whistlers and upper hybrid waves observed at times of rocket measurements of the electron velocity distribution functions, it is shown that the distribution functions containing low-energy beams are unstable to upper hybrid waves in the immediate vicinity of the rocket, and stable or weakly unstable to the linear growth of electrostatic waves. Consideration of various possible mechanisms for low-energy beam acceleration results in the suggestion of a mechanism involving the acceleration of cold ionospheric electrons encountering an open electric equipotential when an arc moves into a previously undisturbed region of the ionosphere. The high-energy beams are explained by the acceleration of plasma from a high-altitude source through closed or U-shaped electric equipotentials leading to plateaus plus residual high-energy beams following an instability process.

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