Discrepancy between electron heating and cooling rates derived from Atmosphere Explorer-C measurements

Details Discrepancy between electron heating and cooling rates derived from Atmosphere Explorer-C measurements Discrepancy between electron heating and cooling rates derived from Atmosphere Explorer-C measurements

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5421b&link_type=abstract

Journal of Geophysical Research, vol. 81, Nov. 1, 1976, p. 5421-5429.

Computer Science

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Atmospheric Heat Budget, Electron Density Profiles, Electron Energy, Ionospheric Heating, Ionospheric Sounding, Midlatitude Atmosphere, Satellite Observation, Charged Particles, Electron Scattering, Explorer Satellites, Ionospheric Electron Density, Neutral Particles, Oxygen Atoms, Particle Collisions, Plasma Heating

Scientific paper

The present theory of electron temperature in the daytime mid-latitude ionosphere is tested by using Atmosphere Explorer-C measurements. In the region below 300 km, where a balance is expected between electron heating by photoelectron impact and electron cooling to ions and neutrals, we find an imbalance in which the cooling rate is consistently higher than the heating rate. The shapes of the altitude profiles also differ substantially. The cooling rate has a sharp peak at about 220 km, while the heating rate exhibits a broad peak about 30 km lower. Improved agreement is achieved at higher altitudes by using an oxygen fine structure loss rate smaller by a factor of 2, based on more recent collision strength calculations. Although this improves the overall agreement of the heating and cooling rates, the shape discrepancy remains, and the new cooling rate falls consistently below the heating rate below 200 km.

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