Computer Science – Sound
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rvgsp..19..185s&link_type=abstract
Reviews of Geophysics and Space Physics, vol. 19, Feb. 1981, p. 185-211.
Computer Science
Sound
47
Atmospheric Sounding, Auroral Zones, Equatorial Atmosphere, Particle Precipitation, Atmospheric Models, Auroral Arcs, Particle Diffusion, Propagation Modes, Rocket Sounding, Whistlers
Scientific paper
Present understanding of the aurora and its precipitation processes is assessed through consideration of four auroral categories: (1) the diffuse aurora, forming the equatorward boundary of the auroral oval; (2) auroral patches and pulsations, appearing within the morning sector of the diffuse aurora; (3) the discrete aurora, observed in the evening and poleward sectors of the auroral oval; and (4) the inverted-V aurora, of the same regions as the discrete aurora but of much greater size. It is found that the diffuse aurora is the result of pitch angle scattering by electrostatic cyclotron waves, and that the auroral pulsations and patches are the result of pitch angle scattering of more energetic electrons by magnetic whistler mode waves. Patches may represent enhanced ionization flux tubes tied to the lower ionosphere, and the discrete aurora is seen as the result of electron acceleration, parallel to the magnetic field, by the quasi-static electric field of a current-driven, laminar electrostatic V shock. While inverted-V precipitation theory is not well developed, observations suggest a relationship to ion cyclotron anomalous resistivity.
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