Dynamic effects on atomic and molecular oxygen density distributions in the upper atmosphere

Physics

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Scientific paper

Equations of motion and continuity for atomic and molecular oxygen density in regions between 70 and 170 km are solved numerically as a time-dependent problem. An implicit numerical method is useful to solve the system of these equations. The result indicates that the atmospheric diffusion and mixing play an important role in determining the [O] and [O2] distributions. These distributions finally approach a steady state in which the dissociation term is balanced with the transport term due to molecular diffusion in higher regions, while the recombination term is balanced with the transport term due to eddy mixing in lower regions. Comparison of height variations in and the mean molecular weight in the asymptotic solution with recent rocket observations indicates that the vertical eddy diffusion coefficient is about 107 cm2 sec-1 with a tendency to decrease slightly in lower regions. The result also implies that the turbopause is generally higher than the homopause. The variations in eddy diffusion coefficient, temperature and solar fluxes can be invoked to explain the seasonal and solar cycle variations in the electron density in the F-region.

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