DOI: 10.1002/2017JA025163
Scopus记录号: 2-s2.0-85044545843
论文题名: Effect of the Lateral Exospheric Transport on the Horizontal Hydrogen Distribution Near the Exobase of Mars
作者: Chaufray J.-Y. ; Yelle R.V. ; Gonzalez-Galindo F. ; Forget F. ; Lopez-Valverde M. ; Leblanc F. ; Modolo R.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 3 起始页码: 2441
结束页码: 2454
语种: 英语
英文关键词: exosphere
; hydrogen
; Mars
英文摘要: We simulate the hydrogen density near the exobase of Mars, using the 3-D Martian Global Circulation Model of Laboratoire de Météorologie Dynamique, coupled to an exospheric ballistic model to compute the downward ballistic flux. The simulated hydrogen distribution near the exobase obtained at two different seasons—Ls = 180° and Ls = 270°—is close to Zero Net Ballistic Flux equilibrium. In other words, the hydrogen density near the exobase adjusts to have a balance between the local upward ballistic and the downward ballistic flux due to a short lateral migration time in the exosphere compared to the vertical diffusion time. This equilibrium leads to a hydrogen density n near the exobase directly controlled by the exospheric temperature T by the relation nT5/2 = constant. This relation could be used to extend 1-D hydrogen exospheric model of Mars used to derive the hydrogen density and escape flux at Mars from Lyman-α observations to 3-D model based on observed or modeled exospheric temperature near the exobase, without increasing the number of free parameters. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114335
Appears in Collections: 气候减缓与适应
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作者单位: LATMOS/IPSL, UPMC University Paris 06 Sorbonne Universités, UVSQ, CNRS, Paris, France; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; Instituto de Astrofisica de Andalucía, CSIC, Granada, Spain; Laboratoire de Météorologie Dynamique, IPSL, CNRS, Paris, France
Recommended Citation:
Chaufray J.-Y.,Yelle R.V.,Gonzalez-Galindo F.,et al. Effect of the Lateral Exospheric Transport on the Horizontal Hydrogen Distribution Near the Exobase of Mars[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)