Physics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9311247m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Oct. 1, 1988, p. 11247-11262.
Physics
14
Atmospheric Physics, Gravity Waves, Upper Atmosphere, Venus Atmosphere, Atmospheric Composition, Carbon Dioxide, Gas Density, Latitude, Pioneer Venus Spacecraft, Transfer Functions
Scientific paper
The transfer function model of Mayr et al. (1984, 1987) for a dissipative multiconstituent atmosphere on earth was modified to describe gravity waves in the thermosphere of Venus in terms of spherical and Fourier harmonics. This model is used to interpret density perturbations in CO2, O, and He which were observed with the orbital neutral mass spectrometer on Pioneer Venus. Results indicate that, in agreement with observations, for localized sources in the lower atmosphere and thermosphere of the same magnitude day and night, the computed wave amplitudes at satellite altitudes are about a factor of 3 to 5 larger during the night than during the day (due to the large night to day increase in the thermospheric temperature); waves excited in the lower atmosphere propagate more obliquely, and geometric attenuation and dissipation are less important than for the thermosphere. Due to wind-induced diffusion, the computed wave amplitudes for CO2, O, and He are of comparable magnitude (with the magnitude of CO2 being the largest).
Dube Martin
Harris Isadore
Kasprzak Wayne T.
Mayr Hans G.
Varosi Frank
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