H2abundance in the atmosphere of Venus
作者： Shailendra Kumar , Donald M. Hunten , Harry A. Taylor
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摘要: The in situ measurements from the Pioneer Venus Orbiter (PVO) Ion Mass Spectrometer have led to detection of H2+ ions ionosphere. Although is a minor ion, its measurement provides first direct clue for determining H2 abundance upper atmosphere Venus. A photochemical model using PVO used derive an mixing ratio 10 ppm below 140 km altitude. presence this much confirms our previous prediction that reactions O+ with and subsequent recombination OH+ provide important source nonthermal H observed exosphere. estimated escape flux ∼108 cm−2 s−1
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