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Flow Vortex-Associated Downward Field-Aligned Current Retreating in the Near-Earth Plasma Sheet

文献类型：期刊论文

作者Yuan, Huanzhi4,5; Zhang, Hui1,2,4,6; Lu, Jianyong5; Zhu, Changbo3; Wang, Ming5
刊名EARTH AND SPACE SCIENCE
出版日期2020-02-01
卷号7期号:2页码:12
DOI10.1029/2019EA000916
英文摘要The formation of field-aligned currents (FACs) of a substorm current wedge is a key element of substorms. Conjunctive observations of a downward FAC during a substorm on 20 December 2007 were made in space by THEMIS satellites and on the ground by geomagnetic field and aurora stations, which provides a unique opportunity to investigate the generation of downward FAC. On the ground, AL index decreased significantly at 04:17:00 UT, denoting the onset of the substorm. The geomagnetic perturbations observed at the postmidnight station KUUJ show that the FAC of the substorm current wedge flowed into the ionosphere. Meanwhile, in space, two THEMIS satellites, THC and THB, the magnetic footprints of which were close to the postmidnight station KUUJ, were located in the near-Earth magnetotail and recorded the outside-in signatures of the plasma sheet thinning first and then the large-scale inside-out propagating plasma flow vortex inferred from the rotation of the flow vector. The magnitude of the FAC was estimated by using the bipolar BY perturbations associated with the flow vortex. It is found that this FAC was so strong that it cannot be produced by the time derivative of the vorticity and that the pressure gradient may act in this event. The upward flowing low-energy electrons are the possible carriers for this FAC.
WOS关键词MAGNETIC-FIELD ; MAGNETOSPHERE ; MODEL ; SIGNATURES ; SUBSTORMS ; BRAKING
资助项目National Science Foundation of China[41731068] ; National Science Foundation of China[41774175] ; National Science Foundation of China[41574158] ; National Science Foundation of China[41621063] ; Research Innovation Program for College Graduates of Jiangsu Province[KYLX16_0950]
WOS研究方向Astronomy & Astrophysics ; Geology
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000529236000016
资助机构National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province ; Research Innovation Program for College Graduates of Jiangsu Province
源URL[http://ir.iggcas.ac.cn/handle/132A11/96245]  
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Zhang, Hui
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Natl Space Sci Ctr, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
5.Nanjing Univ Informat Sci & Technol, Coll Math & Stat, Inst Space Weather, Nanjing, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Yuan, Huanzhi,Zhang, Hui,Lu, Jianyong,et al. Flow Vortex-Associated Downward Field-Aligned Current Retreating in the Near-Earth Plasma Sheet[J]. EARTH AND SPACE SCIENCE,2020,7(2):12.
APA Yuan, Huanzhi,Zhang, Hui,Lu, Jianyong,Zhu, Changbo,&Wang, Ming.(2020).Flow Vortex-Associated Downward Field-Aligned Current Retreating in the Near-Earth Plasma Sheet.EARTH AND SPACE SCIENCE,7(2),12.
MLA Yuan, Huanzhi,et al."Flow Vortex-Associated Downward Field-Aligned Current Retreating in the Near-Earth Plasma Sheet".EARTH AND SPACE SCIENCE 7.2(2020):12.

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来源：地质与地球物理研究所

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