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DOI: 10.1002/2015GL065269
论文题名:
Ionopause-like density gradients in the Martian ionosphere: A first look with MAVEN
作者: Vogt M.F.; Withers P.; Mahaffy P.R.; Benna M.; Elrod M.K.; Halekas J.S.; Connerney J.E.P.; Espley J.R.; Mitchell D.L.; Mazelle C.; Jakosky B.M.
刊名: Geophysical Research Letters
ISSN: 0094-8502
EISSN: 1944-8233
出版年: 2015
卷: 42, 期:21
起始页码: 8885
结束页码: 8893
语种: 英语
英文关键词: ionopause ; ionosphere ; Mars
Scopus关键词: Carrier concentration ; Electron density measurement ; Electron energy levels ; Ionosphere ; Ionospheric measurement ; Magnetic fields ; Magnetism ; Comprehensive measurement ; Density gradients ; Electron energy spectrum ; Ionopause ; Mars ; Martian ionosphere ; Statistical study ; Volatile evolution ; Magnetoplasma ; altitude ; electron density ; flux measurement ; ionosphere ; magnetic field ; magnetization ; Mars ; Martian atmosphere ; plasma ; spacecraft ; spectrum ; statistical analysis
英文摘要: For unmagnetized planets, the top of the ionosphere is often marked by a sharp change in electron density and other plasma properties, called an ionopause. Here we present a statistical study of dayside ionopause-like density gradients observed in 54% of ion density profiles from the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission spacecraft at Mars. Prior studies of the Martian ionopause have lacked simultaneous comprehensive measurements of plasma and magnetic field properties. Therefore, we use MAVEN observations of the electron density, magnetic field, and ion and electron energy spectra to study the factors that influence properties of the ionopause. On average, profiles with an ionopause are accompanied by a higher energy flux of protons at high altitudes and stronger magnetic field at low altitude than profiles without an ionopause. At altitudes above ~300 km, the O+/O2+ ratio is significantly larger for profiles with an ionopause than those without an ionopause. These findings enhance our understanding of this important plasma boundary at Mars. © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955171237&doi=10.1002%2f2015GL065269&partnerID=40&md5=a1135051533bc7b1b11717aea5e7eb1c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8118
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: Center for Space Physics, Boston University, Boston, MA, United States

Recommended Citation:
Vogt M.F.,Withers P.,Mahaffy P.R.,et al. Ionopause-like density gradients in the Martian ionosphere: A first look with MAVEN[J]. Geophysical Research Letters,2015-01-01,42(21).
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