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Flow Vortex-Associated Downward Field-Aligned Current Retreating in the Near-Earth Plasma Sheet
Alternative TitleWOS:000529236000016
Yuan, Huanzhi1; Zhang, Hui1,2,3,4; Lu, Jianyong; Zhu, Changbo5; Wang, Ming
Source PublicationEARTH AND SPACE SCIENCE
2020
Volume7Issue:2Pages:UNSP e2019EA000916
DOI10.1029/2019EA000916
Language英语
KeywordMAGNETIC-FIELD MAGNETOSPHERE MODEL SIGNATURES SUBSTORMS BRAKING
AbstractThe 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.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7554
Collection中国科学院国家空间科学中心
Affiliation1.Nanjing Univ Informat Sci & Technol, Coll Math & Stat, Inst Space Weather, Nanjing, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing, Peoples R China
5.Univ Chinese Acad Sci, Coll Earth Sci, Beijing, Peoples R China
6.Chinese Acad Sci, Natl Space Sci Ctr, Beijing, Peoples R China
Recommended Citation
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):UNSP e2019EA000916.
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),UNSP e2019EA000916.
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):UNSP e2019EA000916.
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