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Venus thermosphere and exosphere - First satellite drag measurements of an extraterrestrial atmosphereAtmospheric 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.
Document ID
19790040150
Document Type
Reprint (Version printed in journal)
Authors
Keating, G. M. (NASA Langley Research Center Hampton, VA, United States)
Tolson, R. H. (NASA Langley Research Center Hampton, Va., United States)
Hinson, E. W. (Old Dominion University Research Foundation, Norfolk, Va., United States)
Date Acquired
August 9, 2013
Publication Date
February 23, 1979
Publication Information
Publication: Science
Volume: 203
Subject Category
LUNAR AND PLANETARY EXPLORATION
Distribution Limits
Public
Copyright
Other