Suprathermal electron energy distribution within the dayside Venus ionosphere

Details Suprathermal electron energy distribution within the dayside Venus ionosphere Suprathermal electron energy distribution within the dayside Venus ionosphere

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.7754k&link_type=abstract

Journal of Geophysical Research, vol. 85, Dec. 30, 1980, p. 7754-7758. Bundesministerium für Forschung und Technologie

Physics

7

Venus, Electrons, Energy, Distribution, Dayside, Ionosphere, Pvo Mission, Orpa Instrument, Spacecraft Observations, Spectra, Shape, Magnitude, Heat, Vertical Transport, Conductivity, Temperature, Thermal Properties, Source, Models, Comparisons, Calculations, Radiation, Ultraviolet, Solar Wind

Scientific paper

The suprathermal electron energy distribution for the dayside ionosphere has been derived from data returned by the Pioneer-Venus orbiter retarding potential analyzer. The shape and magnitude of the spectrum are consistent with the assumption that solar EUV radiation is the only significant source. The magnitude of the spectrum and its variation with altitude suggest that significant vertical transport occurs, with the electrons being lost through the ionopause. In turn, significant vertical transport suggests that the effective vertical electron heat conductivity may be comparable to the field-free value. The heat input to the thermal electron gas from the measured suprathermal electron flux is too small by a factor of at least five to maintain the observed electron temperature profile if the electron thermal conductivity is assumed to be close to the field-free value. It is thus inferred that most of the heat is supplied by the solar wind.

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