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H2 abundance in the atmosphere of Venus (1981)

Taylor, H. A., Jr. ; Hunten, D. M. ; Kumar, S.

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Publication Date: 2011-08-18

Description: 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.

Keywords: LUNAR AND PLANETARY EXPLORATION

Type: Geophysical Research Letters; 8; Mar. 198

Format: text

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