A numerical model for the dynamics and composition of the Venusian thermosphere

Details A numerical model for the dynamics and composition of the Venusian thermosphere A numerical model for the dynamics and composition of the Venusian thermosphere

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jats...32.1219d&link_type=abstract

(NASA, State University of New York, AAS, and AGU, Conference on the Atmosphere of Venus, NASA Goddard Institute for Space Studi

Astronomy and Astrophysics

Astronomy

13

Astronomical Models, Atmospheric Circulation, Atmospheric Composition, Thermosphere, Venus Atmosphere, Atmospheric Models, Hydrodynamics, Mesosphere, Planetary Ionospheres, Wind Profiles

Scientific paper

The structure, composition, and winds of the mesosphere and thermosphere of Venus are investigated, using a nonlinear time-dependent hydrodynamic model. A large-scale circulation is calculated, consisting of a single cell with rising motion on the dayside, sinking motion on the nightside, and day-to-night horizontal flow. This circulation removes light gases and balances the photodissociation. Large concentrations of light gases build up on the nightside. The consequent increase in pressure at a given level blocks the nightward circulation. Hence most downward vertical motion occurs within an internal boundary layer just to the nightside of the terminator. Exospheric temperatures predicted range from greater than 600 K at the subsolar point to less than 300 K at the antisolar point, whereas there are typically 20-40 K horizontal temperature variations in the mesosphere. Maximum horizontal velocities are about 300 m/s and occur on the dayside near the terminator at the exobase level. The model predicts that CO and O will have relative number densities of 4% on the dayside at the level of the F-1 ionospheric peak.

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