Evidence of solar wind energy deposition into the ionosphere of Mars

Details Evidence of solar wind energy deposition into the ionosphere of Mars Evidence of solar wind energy deposition into the ionosphere of Mars

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9012057m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Dec. 1, 1985, p. 12,057-12,064.

Physics

8

Hot Electrons, Ionospheric Electron Density, Mars Atmosphere, Planetary Ionospheres, Solar Planetary Interactions, Solar Wind, Deposition, Energy Dissipation, Energy Spectra, Extreme Ultraviolet Radiation, Radiation Absorption, Solar Radiation, Viking 1 Spacecraft, Mars, Solar Wind, Energy, Ionosphere, Deposition, Electrons, Flux, Rpa, Retarding Potential Analyzer, Viking 1 Lander, Comparisons, Wavelengths, Ultraviolet, Absorption, Calculations, Theoretical Studies, Attenuation, Transport, Atmosphere, Elect

Scientific paper

Suprathermal electron fluxes measured in the ionosphere of Mars by the retarding potential analyzer (RPA) on Viking lander 1 are presented and compared with the photoelectron flux that is produced by the absorption of the solar EUV. The calculation of the equilibrium photoelectron population on Mars is based on the multistream electron transport theory and a model neutral atmosphere and ionosphere that was actually observed by Viking lander 1. From the theoretical equilibrium photoelectron population, the expected RPA volt-ampere characteristic curves are computed and compared with those recorded by the instrument. The theoretical and the observed RPA currents below about 170 km are in agreement, confirming that the solar EUV is the main source of suprathermal electrons at these altitudes. Above about 170 km an additional source of suprathermal electrons is required to explain the observations.

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