Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..829c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 15, 1983, p. 829-836.
Astronomy and Astrophysics
Astrophysics
12
Atmospheric Composition, Carbon Isotopes, Carbon Monoxide, Mesosphere, Venus Atmosphere, Atmospheric Models, Electron Transitions, Radiation Absorption, Radiative Transfer, Venus, Mesosphere, Carbon Monoxide, Isotopic Ratios, Atmosphere, Models, Absorption, Microwaves, Radiative Transfer, Spectra, Analysis, Nightside, Abundance, Procedure, Observations
Scientific paper
Measurements of the absorptions in the Venus atmosphere by (C-12)O and (C-13)O in the J = 1-2 microwave, rotational transitions are reported. Radiative transfer models were fitted to the spectra in order to estimate the isotopic ratio (C-12)O/(C-13)O = 185. Based on an extensive error analysis it is suggested that the standard deviation of this value is + or - 69. This result applies to the mesosphere of Venus, i.e., from about 80 to 110 km. Values of the (C-12)O/(C-13)O ratio measured deeper in the Venus atmosphere are closer to the terrestrial value of 89. Several possible, qualitative mechanisms to explain the higher value of (C-12)O/(C-13)O found for the nightside mesosphere of Venus are offered.
Clancy Todd R.
Muhleman Duane O.
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