Venus I. Carbon monoxide distribution and molecular-line searches |
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| Authors: | WJ Wilson MJ Klein RK Kahar S Gulkis ET Olsen PTP Ho |
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| Institution: | The Aerospace Corporation, El Segundo, California 90245, USA;Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA;Radio Astronomy Laboratory, University of California, Berkeley, California 94720, USA |
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| Abstract: | An observational program to study variations of the vertical distribution of CO in the Venus atmosphere is presented. Measurements of the J = 0 → 1 absorption line at 2.6 mm wavelength are reported for two phase angles in 1977, one near eastern elongation (Feb.) and the other near inferior conjunction (Apr.). The two spectra are significantly different, with the April absorption line being narrower and deeper. The results of numerical inversion calculations show that the CO mixing ratio increases a factor of ～ 100 between 78 and 100 km and that the CO abundance above ～ 100 km is greatest on the night-side hemisphere. These conclusions are in qualitative agreement with theoretical models. In addition to the CO observations, a search for other molecules was made to provide further information on the composition of the Venus middle atmosphere. The J = 0 → 1 transition of 13CO was detected and upper limits were derived for nine other molecules. |
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