H2 abundance in the atmosphere of Venus
H2 abundance in the atmosphere of Venus
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DOI：
10.1029/gl008i003p00237
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发表时间：
1981-03
影响因子：
5.2
通讯作者：
Shailendra Kumar;D. Hunten;H. Taylor
中科院分区：
文献类型：
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作者：
Shailendra Kumar;D. Hunten;H. Taylor
先锋金星轨道飞行器（PVO）离子质谱仪的原位测量导致在金星电离层中检测到H2+离子。虽然H2+是一种次要离子，但它的测量为确定金星高层大气中H2丰度提供了第一个直接线索。使用PVO测量的光化学模型用于推导140公里高度以下10 ppm的H2混合比。如此多的H2的存在证实了我们先前的预测，即O+与H2的反应和随后的OH+的重组提供了在金星外逸层中观察到的非热H的重要来源。H的逃逸通量估计为108 cm−2 s−1
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 our 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 exosphere. The estimated escape flux for H is ∼108 cm−2 s−1