GEOS-2 observations of energetic electrons in the morning sector during auroral radio absorption events

Details GEOS-2 observations of energetic electrons in the morning sector during auroral radio absorption events GEOS-2 observations of energetic electrons in the morning sector during auroral radio absorption events

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47..327c&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 47, April 1985, p. 327-339. Research supported by the Scie

Physics

11

Electromagnetic Absorption, High Energy Electrons, Ionospheric Electron Density, Morning, Radio Auroras, Satellite Observation, Atmospheric Models, Electron Flux Density, Geos 2 Satellite, Ionospheric Propagation, Recombination Coefficient, Riometers, Temporal Distribution

Scientific paper

The temporal development of two auroral absorption events in the morning sector is compared with simultaneous observations of electrons from the satellite GEOS-2, utilizing the good energy resolution over the range 15-300 keV to show that the electrons effective in contributing to the observed radio absorption are confined to the range 30-130 keV. By far the most important are those below 80 keV, and as a geophysical monitor the riometer may be considered an efficient indicator of electron fluxes of energy typically of 60-70 keV. The ionospheric effects of the precipitated fluxes are predicted, and the results used to discuss the validity of the model atmosphere and of the profiles of effective recombination coefficient and specific absorption. Integration of the calculated profiles of incremental radio absorption yields total estimates within 30 percent of the observed intensities. The absorbing layer maximizes at altitudes of 85-90 km and has a typical half-height of 25 km. It is shown further that the electron-flux characteristics are consistent with gradient-curvature drift from a particle source in the midnight sector.

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