Photodissociation of CO2 and related heat evolution, and some emissions, in the thermospheres of Mars and Venus

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Carbon Dioxide, Mars Atmosphere, Photodissociation, Thermosphere, Venus Atmosphere, Heat Transfer, Thermal Emission, Vertical Distribution

Scientific paper

Height profiles of the photodissociation rate of carbon dioxide in the thermospheres of Mars and Venus, and corresponding height profiles of the energy absorption rate and heat release in those thermospheres, are plotted and investigated. The total volume rate of CO2 photodissociation decreases monotonically with height throughout either thermosphere. Heat release due to photodissociation in the lower thermospheres (below 115 km on Mars, 140 km on Venus) dominates over heat release due to photoionization, and competes with the latter in the upper thermospheres. Universal dependences of the dissociation rate and specific heat release on the number of molecules in a column of unit cross section athwart the path of photons and on height are derived.

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