Diffusion in the thermosphere.

Physics

Scientific paper

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Planetary Atmospheres: Diffusion, Earth Thermosphere: Diffusion

Scientific paper

An accurate description of diffusion processes within a planet's thermosphere is presented using Stefan-Maxwell relationships for turbulent mass transport. A numerical modeling is carried out (using one-dimensional hydrodynamic equations) for the structure of the Earth's upper atmosphere over the height range 70 - 400 km. The effect of the parameters zm (position of the maximum of the turbulent diffusion coefficient KT) and S1, which determines the character of the decrease in KT at z > zm, upon atomic oxygen distribution at heights of 80 - 120 km is studied. It is shown that the oxogen profile has a single maximum when zm = 100 km or more, while at zm = 90 km two atomic oxygen maxima are formed at heights of 100 - 104 and 83 - 85 km, as has been observed in experiment at the same heights. The oxygen profile calculations for zm = 90 - 85 km agree best with the atomic oxygen profile of the MSISE90 semi-empirical model.

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