Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..719h&link_type=abstract
Geophysical Research Letters, vol. 5, Aug. 1978, p. 719-722.
Astronomy and Astrophysics
Astronomy
Atmospheric Circulation, Atmospheric Composition, Atmospheric Models, Venus Atmosphere, Astronomical Models, Carbon Dioxide, Diurnal Variations, Hydrogen Atoms, Turbulent Diffusion, Upper Atmosphere, Venus, Atmosphere, Hydrogen, Density, Models, Gases, Wind, Exosphere, Temperatures, Flow, Flux, Thermosphere, Atmospheric Circulation
Scientific paper
The global density distribution of atomic H in the upper atmosphere of Venus is determined in terms of a global circulation model. It is shown that H produced on the dayside is efficiently advected to the nightside by the major gas CO2 where it is then convected to lower altitudes and recombines. A maximum night/day H density ratio of about 5 is derived, in which case exospheric return flow from night to day strongly limits the nightside density enhancement. A previously postulated constraint connecting the eddy diffusion coefficient with the escape flux of H in one dimensional models is no longer required when global circulation of H is considered.
Bauer Siegfried J.
Hartle Richard E.
Mayr Hans G.
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