The temperature inversion in the thermosphere

Computer Science

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Atmospheric Composition, Atmospheric Temperature, Solar Activity Effects, Temperature Inversions, Thermosphere, Turbulent Heat Transfer, Atmospheric Electricity, Atmospheric Heat Budget, Atmospheric Models, Atmospheric Turbulence, Mass Transfer, Midlatitude Atmosphere, Polar Regions, Solar Terrestrial Interactions, Vertical Distribution

Scientific paper

Consideration is given to the problem of accounting for the existence of regions of the lower thermosphere where temperature decreases with increasing solar activity by a mechanism involving turbulent heat transfer. Calculations are presented for a one-dimensional model of the thermosphere between 80 and 300 km in which variations in thermospheric composition as well as temperature are taken into account. It is shown that vertical macroscopic and turbulent heat and mass transfer may lead to regions of temperature inversion by up to 30% upon increases in solar activity, occurring at high latitudes in the presence of increased thermospheric heating. The concentrations of the major neutral constituents of the thermosphere are, however, found to exhibit only one inversion region, with variations between the times of solar activity minima and maxima not exceeding 20%.

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