Diffusion model for the upper atmosphere of Venus

Details Diffusion model for the upper atmosphere of Venus Diffusion model for the upper atmosphere of Venus

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.4411m&link_type=abstract

Journal of Geophysical Research, vol. 83, Sept. 1, 1978, p. 4411-4416.

Physics

1

Atmospheric Diffusion, Upper Atmosphere, Venus Atmosphere, Wind Effects, Atmospheric Composition, Atmospheric Models, Helium, Hydrogen, Night Sky, Oxygen, Gases, Dynamics, Atmospheric Circulation, Models, Motion, Diffusion, Atmosphere, Venus, Diurnal Variations, Wind, Thermosphere, Rotation, Perturbations, Oxygen, Flow, Hydrogen, Helium, Density

Scientific paper

On the basis of a linear theory it is shown that wind-induced diffusion associated with large-scale circulation in the Venus atmosphere leads to nighttime bulges in O, He, and H. The effect on He is very large with a 243-day rotation period of the atmosphere, yielding an upper limit for the maximum/minimum diurnal density ratio of approximately 1000. This ratio is much smaller for H (max/min of about 4) due to the greater importance of exospheric flow, which acts (as for He) as a damping mechanism. For the faster rotation period of 4 days consistent with the motions of the cloud tops, the diurnal variation of O is significantly reduced, contributing to an increase by a factor of two in the horizontal wind velocity. The same effect significantly reduces the He variations to an increase by a factor of 7 from day to night. The results suggest that composition and wind measurements provide valuable information on the rotation rate of the Cytherean thermosphere.

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