Structure and dynamics of the Venus thermosphere

Physics

Scientific paper

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Atmospheric Models, Thermosphere, Venus Atmosphere, Atmospheric Attenuation, Atmospheric Temperature, Navier-Stokes Equation, Solar Radiation, Temperature Distribution

Scientific paper

A theoretical model of the Venus thermosphere is constructed. For this purpose, the thermosphere is considered a continuous medium, and the system of gas-dynamics equations in the Navier-Stokes form is used for its description. Two variants of the model considered differ by: neglecting the rotation of the Venus mesosphere, and taking into account the mesosphere rotation with a period equal to four earth days in the direction of the Venus rotation. It is shown that absorption of solar radiation on the daylight side cause global circulation with vertical motions upward on the daylight side and downward on the night side. The temperature is distributed with a great difference between temperatures of the upper atmosphere on the daylight and night sides of the planet. Calculated and experimentally obtained temperatures coincide well, indicating that the level of solar activity accepted for calculations is sufficient for the observed heating of the thermosphere.

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