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Modeling of the O+ pickup ion sputtering efficiency dependence on solar wind conditions for the Martian atmosphere
Wang, Yung-Ching; Luhmann, Janet G.; Leblanc, Francois; Fang, Xiaohua; Johnson, Robert E.; Ma, Yingjuan; Ip, Wing-Huen; Li, Lei; Wang, YC (reprint author), Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
2014
Volume119Issue:1Pages:93-108
ISSN2169-9097
Language英语
KeywordMars Upper Atmosphere Atmosphere Mars
AbstractSputtering of the Martian atmosphere by O(+)pickup ions has been proposed as a potentially important process in the early evolution of the Martian atmosphere. In preparation for the Mars Atmosphere and Volatile Evolution (MAVEN) mission, we performed a study using a Monte Carlo model coupled to a molecular dynamic calculation to investigate the cascade sputtering effects in the region of the Martian exobase. Pickup ion fluxes based on test particle simulations in an MHD model for three different solar wind conditions are used to examine the local and global sputtering efficiencies. The resultant sputtering escape rate is 2x10(24)s(-1) at nominal solar wind condition and can be enhanced about 50 times when both the interplanetary magnetic field (IMF) strength and the solar wind pressure increase. It is found that when the IMF strength becomes stronger, both the pickup ion precipitation energies and the resultant sputtering efficiencies increase. The related escape flux, hot component, and atmospheric energy deposition deduced from the MAVEN measurements may reveal clues about the prominent enhanced sputtering effects. Significant hemispheric asymmetries can be observed related to the solar wind electric fields. The shielding by the crustal fields and the recycling onto the nightside due to different magnetic field draping features can also lead to regional variations of sputtering efficiencies. The results suggest that disturbed or enhanced solar wind conditions provide the best prospects for detecting sputtering effects for MAVEN mission.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/2771
Collection空间科学部
Corresponding AuthorWang, YC (reprint author), Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
Recommended Citation
GB/T 7714
Wang, Yung-Ching,Luhmann, Janet G.,Leblanc, Francois,et al. Modeling of the O+ pickup ion sputtering efficiency dependence on solar wind conditions for the Martian atmosphere[J]. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,2014,119(1):93-108.
APA Wang, Yung-Ching.,Luhmann, Janet G..,Leblanc, Francois.,Fang, Xiaohua.,Johnson, Robert E..,...&Wang, YC .(2014).Modeling of the O+ pickup ion sputtering efficiency dependence on solar wind conditions for the Martian atmosphere.JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,119(1),93-108.
MLA Wang, Yung-Ching,et al."Modeling of the O+ pickup ion sputtering efficiency dependence on solar wind conditions for the Martian atmosphere".JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 119.1(2014):93-108.
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