Physics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.4341n&link_type=abstract
Journal of Geophysical Research, vol. 82, Sept. 30, 1977, p. 4341-4349.
Physics
107
Atmospheric Composition, Mars Atmosphere, Mass Spectroscopy, Upper Atmosphere, Atmospheric Temperature, Carbon Dioxide, Gas Density, Nitrogen 15, Spacecraft Instruments, Thermosphere, Vertical Distribution, Viking Spacecraft
Scientific paper
The upper atmospheric mass spectrometers flown on Viking 1 and 2 are described, and results obtained for the composition and structure of Mars' upper atmosphere are summarized. Carbon dioxide is the major constituent of the atmosphere at all heights below 180 km. The thermal structure of the upper atmosphere is complex and variable with average temperatures below 200 K for both Viking 1 and 2. The atmosphere is mixed to heights in excess of 120 km. The isotopic composition of carbon and oxygen in the Martian atmosphere is similar to that in the terrestrial atmosphere: N-15 is enriched in Mars' atmosphere by a factor of 1.62 + or - 0.16.
McElroy Michael B.
Nier Alfred O.
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