globalchange  > 科学计划与规划
DOI: 10.1002/2016GL067752
论文题名:
Plasma clouds and snowplows: Bulk plasma escape from Mars observed by MAVEN
作者: Halekas J.S.; Brain D.A.; Ruhunusiri S.; McFadden J.P.; Mitchell D.L.; Mazelle C.; Connerney J.E.P.; Harada Y.; Hara T.; Espley J.R.; DiBraccio G.A.; Jakosky B.M.
刊名: Geophysical Research Letters
ISSN: 0094-9329
EISSN: 1944-9060
出版年: 2016
卷: 43, 期:4
起始页码: 1426
结束页码: 1434
语种: 英语
英文关键词: atmospheric escape ; Mars ; MAVEN
Scopus关键词: Magnetic fields ; Solar wind ; Atmospheric escape ; Coherent structure ; Field measurement ; Magnetic field amplification ; Mars ; Martian atmospheres ; MAVEN ; Volatile evolution ; Heavy ions
英文摘要: We present initial Mars Atmosphere and Volatile EvolutioN (MAVEN) observations and preliminary interpretation of bulk plasma loss from Mars. MAVEN particle and field measurements show that planetary heavy ions derived from the Martian atmosphere can escape in the form of discrete coherent structures or "clouds." The ions in these clouds are unmagnetized or weakly magnetized, have velocities well above the escape speed, and lie directly downstream from magnetic field amplifications, suggesting a "snowplow" effect. This postulated escape process, similar to that successfully used to explain the dynamics of active gas releases in the solar wind and terrestrial magnetosheath, relies on momentum transfer from the shocked solar wind protons to the planetary heavy ions, with the electrons and magnetic field acting as intermediaries. Fluxes of planetary ions on the order of 107 cm-2 s-1 can escape by this process, and if it operates regularly, it could contribute 10-20% of the current ion escape from Mars. ©2016. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84959378856&doi=10.1002%2f2016GL067752&partnerID=40&md5=156dbfd967d265185d125b9990e5480e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10292
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States

Recommended Citation:
Halekas J.S.,Brain D.A.,Ruhunusiri S.,et al. Plasma clouds and snowplows: Bulk plasma escape from Mars observed by MAVEN[J]. Geophysical Research Letters,2016-01-01,43(4).
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