CO(+) and N2(+) in the Venus ionosphere

Details CO(+) and N2(+) in the Venus ionosphere CO(+) and N2(+) in the Venus ionosphere

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.8473p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Aug. 1, 1988, p. 8473-8482.

Physics

3

Atmospheric Composition, Ionospheric Ion Density, Molecular Ions, Planetary Ionospheres, Positive Ions, Venus Atmosphere, Carbon Monoxide, Gas Mixtures, Mass Spectrometers, Nitrogen Ions, Pioneer Venus Spacecraft

Scientific paper

UV and near-UV spectra of CO(+) and N2(+) in the Venus ionosphere were examined with the purpose of determining the signatures of the absolute abundance of these species as well as of their neutral precursors, CO and N2. Analytic expressions for the distribution of CO(+), N2(+), O(+) (2D), and O(+) (2P) were developed, which accurately reproduce the results of a one-dimensional photochemical diffusive model, over the altitude range of interest (120-195 km), of the Pioneer Venus Orbiter ion mass spectrometer data and predict the airglow signature of these minor ions. It is shown that, by incorporating recent laboratory measurements by Mitchell and Hus (1985) of the dissociative recombination rate of CO(+) as well as reactions with metastable O(+) ions reported by Fox (1982), the earlier discrepancy between theory and data can be removed. It is shown that the densities of CO(+), N2(+), and metastable O(+) are sensitive to the model atmosphere chosen.

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