Computer Science
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ge%26ae..19..739v&link_type=abstract
Geomagnetizm i Aeronomiia, vol. 19, July-Aug. 1979, p. 739-741. In Russian.
Computer Science
Electron Beams, Energetic Particles, Ionospheric Disturbances, Rarefied Plasmas, Auroras, Electron Energy, Energy Dissipation, Ionospheric Electron Density, Linear Equations, Molecular Relaxation
Scientific paper
Energetic electron fluxes entering the ionosphere produce plasma concentration disturbances and such effects as polar auroras. Conventionally, data are interpreted on the assumption that dissipation of electron flux energy occurs by collision with neutrals. Recent research, however, has shown that for highly anisotropic electron beams (pitch angle less than 20 or 30 deg) with energy fluxes greater than 100 erg/sq cm-sec, collective interactions with the ionized component of the ionospheric plasma play a significant part, particularly, at heights between 120 and 130 km, where beam energy losses may amount to 30 percent. Analysis of beam relaxation in quasi-linear approximation has been found to underestimate appreciably the beam relaxation length (l = 1 km). In the present paper, the decelaration of the relaxation process by modulation instability, modified with allowance for collisions, is taken into consideration, leading to l values between 3 and 10 km.
Mishin Evgeni V.
Volokitin A. S.
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