Banana Current in the Inner Magnetosphere Observed by Van Allen Probes

被引：1
|
作者：
Wang, Tong-Hui [1 ,2 ,3 ,4 ]
Zhang, Xiao-Xin [3 ,4 ]
He, Fei [5 ]
Lv, Jing-Tian [3 ,4 ]
Zong, Qiu-Gang [6 ]
Fu, Hui-Shan [7 ,8 ]
机构：
[1] Nanjing Univ Informat Sci & Technol, Nanjing, Peoples R China
[2] Chinese Acad Sci, State Key Lab Space Weather, Beijing, Peoples R China
[3] China Meteorol Adm, Natl Satellite Meteorol Ctr, Natl Ctr Space Weather, Key Lab Space Weather, Beijing, Peoples R China
[4] Innovat Ctr FengYun Meteorol Satellite FYSIC, Beijing, Peoples R China
[5] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
[6] Peking Univ, Inst Space Phys & Appl Technol, Sch Earth & Space Sci, Beijing, Peoples R China
[7] Beihang Univ, Sch Space & Environm, Beijing, Peoples R China
[8] MIIT, Key Lab Space Environm Monitoring & Informat Proc, Beijing, Peoples R China
来源：
GEOPHYSICAL RESEARCH LETTERS | 2023年 / 50卷 / 12期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
STEADY-STATE RESPONSE; LOW-LATITUDE STATIONS; RING CURRENT; MAGNETIC-FIELD; SUDDEN IMPULSES; PRESSURE; CLUSTER;
D O I：
10.1029/2023GL104429
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
By using the magnetic field data from Van Allen Probes, we analyzed the distribution characteristics of the electromagnetic environment in the inner magnetosphere on different Dst* index and magnetic local time. Our results show that for the response of different current systems, the dawn-dusk and noon-midnight asymmetry distribution of the residual magnetic field delta B increases with Dst* index. When Dst* < -60 nT, a "banana"-shaped geomagnetic field negative disturbance peak region appears in the sector from midnight to dusk. Then, we obtained the azimuthal current density and found the asymmetric internal eastward and external westward ring current. Through the vector analysis of three-dimensional current density, the current density vector distribution in the magnetic equatorial plane is completely displayed for the first time, which directly proves the existence of banana current near r = 3.0-4.0 R-E during strong geomagnetic storms.
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页数：8
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