Dayside temperatures of the Martian upper atmosphere

Details Dayside temperatures of the Martian upper atmosphere Dayside temperatures of the Martian upper atmosphere

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9212045b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Nov. 1, 1987, p. 12045-12055.

Physics

8

Atmospheric Temperature, Diffusion Coefficient, Energy Dissipation, Mars Atmosphere, Solar Radiation, Upper Atmosphere, Plasma Density, Ultraviolet Radiation, Mars, Dayside, Temperature, Atmosphere, Exosphere, Energy, Wavelengths, Ultraviolet, Infrared, Turbulence, Dissipation, Cooling, Transport, Models, Diffusion, Solar Radiation, Absorption, Heating, Occultations, Spacecraft Observations, Radio Methods, Calculations, Conduction, Mixing, Diagrams, Carbon Dioxide, Oxygen, Carbon Monoxide, Emissions, Parame

Scientific paper

One central problem in understanding the Martian upper atmosphere is the poor correlation between exospheric temperatures and the energy input from the Sun in the EUV and UV. Turbulence heats the atmosphere by dissipation of turbulent energy and cools it by downward heat transport. A time-variable turbulence may introduce a stochastic component in addition to the solar-driven, regular variation of the exospheric temperatures. To investigate the possible range of temperatures on the basis of this assumption, the authors develop a one-dimensional mean-dayside model of the energy balance of the Martian upper atmosphere. With plausible assumptions on the range of the eddy diffusion coefficient, they find a stochastic component of ±63K for the exospheric temperatures. The comparison of observed data with the results of their model yields a best value for the efficiency of the heating by absorption of solar ultraviolet radiation of 0.145±0.05.

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