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Stagnant low-energy ions in the near cusp region observed by Cluster

文献类型：期刊论文

作者Li, Kun1,2; Wei, Yong1,3; Wan, WeiXing1,3
刊名SCIENCE CHINA-EARTH SCIENCES
出版日期2017-07-01
卷号60期号:7页码:1299-1309
关键词Ionospheric outflow Low-energy ion Potential energy balance Ion stagnation
ISSN号1674-7313
DOI10.1007/s11430-016-9040-1
文献子类Article
英文摘要Measuring the low-energy ions in the Earth's magnetotail lobes is difficult, because a spacecraft becomes positively charged in a sunlit and tenuous plasma environment. Recent studies have introduced a new method, making use of the positive electric potential on the Cluster spacecraft, to measure the low-energy ions (less than a few tens of electronvolts) in the polar caps/magnetotail lobes in the years 2001-2010. With the measured velocities, we are able to study the trajectories of these low-energy ions. Particle tracing has been used in previous studies, confirming that ions of ionospheric origin are the dominant contributor to the ion population in the Earth's magnetotail lobes. In this work, we continue to study the source of low-energy ions measured in the lobes. We found that not all of the low-energy ions in the lobes come directly from the ionosphere. Particle tracing infers that some of the low-energy ions start to move tailward from the cusp/near-cusp region with a zero parallel velocity. In the following, we refer to these low-energy ions as stagnant low-energy ions. On the other hand, the in situ measurements by Cluster show a population of low-energy ions in the cusp/near-cusp region with pitch angles near 90A degrees (i.e., no significant parallel velocity). The locations of stagnant low-energy ions are determined by particle tracing and in situ measurements. Similar ion energies and spatial distributions determined by these two methods confirm the presence of the stagnant low-energy ion population.
WOS关键词POLAR WIND ; EARTHS MAGNETOSPHERE ; FIELD ; SPECTROMETER ; MAGNETOTAIL ; PLASMA
WOS研究方向Geology
语种英语
WOS记录号WOS:000406020600007
出版者SCIENCE PRESS
资助机构DLR(50 OC 1401) ; National Natural Science Foundation of China(41525016 ; Lunar and Planetary Science Laboratory, Macau University of Science and Technology-Partner Laboratory of Key Laboratory of Lunar and Deep Space Exploration, Chinese Academy of Sciences(039/2013/A2) ; 41474155 ; 41661164034) ; DLR(50 OC 1401) ; National Natural Science Foundation of China(41525016 ; Lunar and Planetary Science Laboratory, Macau University of Science and Technology-Partner Laboratory of Key Laboratory of Lunar and Deep Space Exploration, Chinese Academy of Sciences(039/2013/A2) ; 41474155 ; 41661164034) ; DLR(50 OC 1401) ; National Natural Science Foundation of China(41525016 ; Lunar and Planetary Science Laboratory, Macau University of Science and Technology-Partner Laboratory of Key Laboratory of Lunar and Deep Space Exploration, Chinese Academy of Sciences(039/2013/A2) ; 41474155 ; 41661164034) ; DLR(50 OC 1401) ; National Natural Science Foundation of China(41525016 ; Lunar and Planetary Science Laboratory, Macau University of Science and Technology-Partner Laboratory of Key Laboratory of Lunar and Deep Space Exploration, Chinese Academy of Sciences(039/2013/A2) ; 41474155 ; 41661164034)
源URL[http://ir.iggcas.ac.cn/handle/132A11/42778]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Li, Kun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Lunar & Planetary Sci Lab, Partner Lab Key Lab Lunar & Deep Space Explorat, Macau Univ Sci & Technol, Macau 999078, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Li, Kun,Wei, Yong,Wan, WeiXing. Stagnant low-energy ions in the near cusp region observed by Cluster[J]. SCIENCE CHINA-EARTH SCIENCES,2017,60(7):1299-1309.
APA Li, Kun,Wei, Yong,&Wan, WeiXing.(2017).Stagnant low-energy ions in the near cusp region observed by Cluster.SCIENCE CHINA-EARTH SCIENCES,60(7),1299-1309.
MLA Li, Kun,et al."Stagnant low-energy ions in the near cusp region observed by Cluster".SCIENCE CHINA-EARTH SCIENCES 60.7(2017):1299-1309.

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来源：地质与地球物理研究所

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