Venus thermosphere and exosphere - First satellite drag measurements of an extraterrestrial atmosphere

Details Venus thermosphere and exosphere - First satellite drag measurements of an extraterrestrial atmosphere Venus thermosphere and exosphere - First satellite drag measurements of an extraterrestrial atmosphere

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979sci...203..772k&link_type=abstract

Science, vol. 203, Feb. 23, 1979, p. 772-774.

Computer Science

3

Exosphere, Satellite Drag, Thermosphere, Venus Atmosphere, Atmospheric Composition, Diurnal Variations, Extraterrestrial Environments, Oxygen Atoms, Pioneer Venus 1 Spacecraft, Venus, Thermosphere, Exosphere, Atmosphere, Oxygen, Temperatures, Pioneer Venus 1, Density, Composition

Scientific paper

Atmospheric drag measurements obtained from the study of the orbital decay of Pioneer Venus I indicate that atomic oxygen predominates in the Venus atmosphere above 160 kilometers. Drag measurements give evidence that conditions characteristic of a planetary thermosphere disappear near sundown, with inferred exospheric temperatures sharply dropping from approximately 300 K to less than 150 K. Observed densities are generally lower than given by theoretical models.

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