Venus mesosphere and thermosphere temperature structure. II - Day-night variations

Details Venus mesosphere and thermosphere temperature structure. II - Day-night variations Venus mesosphere and thermosphere temperature structure. II - Day-night variations

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...30..163d&link_type=abstract

Icarus, vol. 30, Jan. 1977, p. 163-178.

Computer Science

16

Atmospheric Models, Atmospheric Temperature, Diurnal Variations, Mesosphere, Thermosphere, Venus Atmosphere, Carbon Dioxide, Carbon Monoxide, Continuity Equation, Equations Of Motion, Oxygen Atoms, Solar Heating, Thermodynamics, Two Dimensional Models, Vertical Distribution

Scientific paper

A two-dimensional nonlinear hydrodynamic model for the mesosphere and thermosphere of Venus is developed which involves a coupled system of four time-independent equations for horizontal motion, temperature, and the relative number concentrations of atomic oxygen and carbon monoxide. Solar radiation drives the model by heating and the dissociation of CO2 into CO + O; 15-micron IR cooling by CO2 is also included in the context of an accurate non-LTE treatment. The model is used to evaluate the horizontal variation of temperature in the upper atmosphere of the planet, and results obtained by assuming two different efficiencies for EUV heating are compared. It is found that the low-efficiency variant yields exospheric temperatures of about 300 K on the dayside and less than 180 K at the antisolar point, while the higher-efficiency variant gives a day-to-night variation over the range from at least 600 K to not less than 250 K.

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