A simple static photochemical transport model for application to the upper atmospheres of Earth, Mars and Venus

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Atmospheric Models, Earth Atmosphere, Mars Atmosphere, Photochemical Reactions, Transport Theory, Upper Atmosphere, Venus Atmosphere, Mass Spectroscopy, Molecular Diffusion, Ultraviolet Radiation

Scientific paper

In order to compare mass spectrometer measurements of the composition of the thermosphere of the Earth with that of other terrestrial planets, model calculations are required, which reflect the influence of photochemical processes and transport on the composition of the thermospheric gas. A computer code was written, which can be easily adapted to the environmental condition of the respective measurement sites. The photochemical model takes the basic reactions in oxygen and carbon dioxide dominated thermospheres under the influence of solar UV radiation into account. The transport model considers molecular diffusion and mixing by eddy diffusion. The model equations are restricted to the vertical dimension and are time independent. Test calculations indicate that such a simplified model reproduces the observed composition in the altitude region of interest for mass spectrometric measurements.

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