DOI: 10.1002/2017JA024463
Scopus记录号: 2-s2.0-85041087670
论文题名: Influence of the Interplanetary Convective Electric Field on the Distribution of Heavy Pickup Ions Around Mars
作者: Johnson B.C. ; Liemohn M.W. ; Fränz M. ; Ramstad R. ; Stenberg Wieser G. ; Nilsson H.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 1 起始页码: 473
结束页码: 484
语种: 英语
英文关键词: convective electric field
; ion escape
; Mars Express
; Mars ion loss
; MEX data analysis
英文摘要: This study obtains a statistical representation of 2–15 keV heavy ions outside of the Martian-induced magnetosphere and depicts their organization by the solar wind convective electric field (ESW). The overlap in the lifetime of Mars Global Surveyor (MGS) and Mars Express (MEX) provides a period of nearly three years during which magnetometer data from MGS can be used to estimate the direction of ESW in order to better interpret MEX ion data. In this paper we use MGS estimates of ESW to express MEX ion measurements in Mars-Sun-Electric field (MSE) coordinates. A new methodological technique used in this study is the limitation of the analysis to a particular instrument mode for which the overlap between proton contamination and plume observations is rare. This allows for confident energetic heavy ion identification outside the induced magnetosphere boundary. On the dayside, we observe high count rates of 2–15 keV heavy ions more frequently in the +ESW hemisphere (+ZMSE) than in the −ESW hemisphere, but on the nightside the reverse asymmetry was found. The results are consistent with planetary origin ions being picked up by the solar wind convective electric field. Though a field of view hole hinders quantification of plume fluxes and velocity space, this new energetic heavy ion identification technique means that Mars Express should prove useful in expanding the time period available to assess general plume loss variation with drivers. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114835
Appears in Collections: 气候减缓与适应
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作者单位: Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, United States; Max-Planck Institute for Solar System Research, Göttingen, Germany; Swedish Institute of Space Physics, Kiruna, Sweden
Recommended Citation:
Johnson B.C.,Liemohn M.W.,Fränz M.,et al. Influence of the Interplanetary Convective Electric Field on the Distribution of Heavy Pickup Ions Around Mars[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)