Physics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..391m&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, April 1984, p. 391-398.
Physics
4
Auroral Absorption, Electron Density (Concentration), Electron Distribution, Electron Energy, Radio Attenuation, Space Plasmas, Absorptivity, Electron Scattering, Electrostatic Probes, High Energy Electrons, Maxwell-Boltzmann Density Function
Scientific paper
An auroral absorption event in the D-region of the atmosphere has been studied by simultaneous measurements of electron temperature, electron density and hyperthermal electrons with a Langmuir probe, and of radio absorption coefficient by 30 MHz riometers. The absorption of the radio waves cannot be explained only by the enhancement of the electron density but requires that the electron collision frequency v be increased above its normal value by the presence of a high energy tail in the electron distribution function. A model is used to determine the characteristics of the hyperthermal electrons in order to evaluate their contribution to the collision frequency and to the absorption coefficient. Good agreement is found between theoretical and experimental values.
Margot-Chaker J.
McNamara Allen G.
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