Loss cone fluxes and pitch angle diffusion at the equatorial plane during auroral radio absorption events

Details Loss cone fluxes and pitch angle diffusion at the equatorial plane during auroral radio absorption events Loss cone fluxes and pitch angle diffusion at the equatorial plane during auroral radio absorption events

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jatp...45..231c&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 45, April 1983, p. 231-243. Research supported by the Scie

Physics

12

Auroral Zones, Electron Diffusion, Electron Distribution, Equatorial Atmosphere, High Energy Electrons, Radio Attenuation, D Region, Electromagnetic Absorption, Electron Precipitation, Geos 2 Satellite, Riometers, Whistlers

Scientific paper

Flux and pitch angle distributions of energetic electrons at geostationary altitude in the vicinity of the atmospheric loss cone associated with an auroral radio absorption event are investigated. Measurements were made in the energy range 15-300 keV by the medium energy charged particle spectrometer on board the GEOS-2 satellite at the times of absorption events detected near the predicted foot of the geomagnetic field line passing through the satellite. Comparisons with theoretical pitch angle distributions and recombination rates indicate pitch angle diffusion coefficients to be 0.001/sec for a 2-dB event and 0.0001/sec for a 1-dB event. Further comparisons of the average electron measurements in the pitch angle range 0-5 deg with observations of the radio absorption by the portion of this flux which is actually precipitated are used to deduce the degree of departure of the electron pitch angle distribution from isotropy, and to place limits upon the ranges of effective recombination rate profiles. An empirical relation is derived which allows radio absorption to be predicted from measured electron fluxes.

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