Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sci...203..787s&link_type=abstract
Science, vol. 203, Feb. 23, 1979, p. 787-790.
Astronomy and Astrophysics
Astronomy
5
Cloud Cover, Planetary Structure, Pressure Distribution, Temperature Profiles, Venus Atmosphere, Venus Clouds, Lower Atmosphere, Pioneer Venus Spacecraft, Radiative Transfer, Spaceborne Astronomy, Thermodynamic Equilibrium, Atmosphere, Venus, Structure, Pioneer Venus, Probes, Clouds, Temperatures, Thermal Properties, Atmospheric Circulations
Scientific paper
Each of the four Pioneer Venus probes carried instruments to measure the structure of the atmosphere, both below the cloud deck and above it to an altitude of at least 120 km. Preliminary results are presented on lower-atmosphere structure, thermal contrasts, and atmospheric stability. Altitudes derived from the data are given along with the temperature profile from 67 to 105 km, derived from the first analysis of the entry data from the north probe. All four probes lost temperature data at the 640 K level, which is at an altitude of about 12 to 14 km. Values of temperature and pressure at touchdown are presented in a table. The pressure differences imply terrain elevation differences at the landing sites. Above 40 km, the measured profile moves from near-adiabatic toward the theoretical profile for radiative equilibrium.
Blanchard Robert C.
Derr John S.
Intrieri P. F.
Juergens David W.
Kirk Donn B.
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