H2 abundance in the atmosphere of Venus

Details H2 abundance in the atmosphere of Venus H2 abundance in the atmosphere of Venus

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..237k&link_type=abstract

Geophysical Research Letters, vol. 8, Mar. 1981, p. 237-240. NASA-supported research.

Physics

34

Abundance, Hydrogen Ions, Mass Spectroscopy, Upper Atmosphere, Venus Atmosphere, Carbon Dioxide, Density Distribution, Molecular Ions, Oxygen Ions, Photoionization, Pioneer Venus 1 Spacecraft, Planetary Ionospheres, Recombination Reactions, Temperature Gradients, Venus, Atmosphere, Hydrogen, Abundance, Pioneer Venus Orbiter, Mixing, Spectrometry, Ions, Ionosphere, Photochemistry, Models, Exosphere, Flux, Temperatures, Density, Altitude, Data

Scientific paper

The in situ measurements from the Pioneer Venus Orbiter (PVO) Ion Mass Spectrometer have led to the detection of H2(+) ions in the Venus ionosphere. Although H2(+) is a minor ion, its measurement provides the first direct clue for determining the H2 abundance in the upper atmosphere of Venus. A photochemical model using PVO measurements is used to derive an H2 mixing ratio of 10 ppm below 140 km altitude. The presence of this much H2 confirms a previous prediction that the reactions of O(+) with H2 and subsequent recombination of OH(+) provide an important source of nonthermal H observed in the Venus atmosphere. The estimated escape flux for H is 10 to the 8th per sq cm/s.

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