Structure of the Venus mesosphere and lower thermosphere from measurements during entry of the Pioneer Venus probes

Details Structure of the Venus mesosphere and lower thermosphere from measurements during entry of the Pioneer Venus probes Structure of the Venus mesosphere and lower thermosphere from measurements during entry of the Pioneer Venus probes

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...49...49s&link_type=abstract

Icarus, vol. 49, Jan. 1982, p. 49-70.

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Atmospheric Temperature, Diurnal Variations, Mesosphere, Pioneer Venus Spacecraft, Thermosphere, Venus Atmosphere, Astronomical Models, Atmospheric Pressure, Atmospheric Sounding, Atmospheric Stratification, Gravity Waves, Venus, Structure, Mesosphere, Thermosphere, Pioneer Venus, Probes, Thermal Properties, Nightside, Atmosphere, Altitude, Analysis, Data, Deceleration, Comparisons, Sounding, Diurnal Variations, Pressure, Dynamics, Venera Missions, Density, Temperature, Velocity, Experiments, Orbiters, Theo

Scientific paper

Data on the thermal structure of the nightside middle atmosphere of Venus, from 84 to 137 km altitude, have been obtained from analysis of deceleration measurements from the third Pioneer Venus small probe, the night probe, which entered the atmosphere near the midnight meridian at 27 deg S latitude. Comparison of the midnight sounding with the morning sounding at 31 deg S latitude indicates that the temperature structure is essentially diurnally invariant up to 100 km, above which the nightside structure diverges sharply from the dayside toward lower temperatures. Very large diurnal pressure differences develop above 100 km with dayside pressure ten times that on the nightside at 126 km altitude. This has major implications for upper atmospheric dynamics. The data are compared with the measurements of Keating et al. (1980) above 140 km, with theoretical thermal structure models of Dickinson, and with data obtained by Russian Venera spacecraft below 100 km. Midnight temperatures are approximately 130 K, somewhat warmer than those reported by Keating et al.

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