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Magnetic dipolarizations inside geosynchronous orbit with tailward ion flows
Sun, Xiaoying; Liu, Weining William; Duan, Suping
Department空间科学部
Source PublicationANNALES GEOPHYSICAE
2019
Volume37Issue:3Pages:289-297
DOI10.5194/angeo-37-289-2019
ISSN0992-7689
Language英语
AbstractElectromagnetic field and plasma data from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) near-Earth probes are used to investigate magnetic dipolarizations inside geosynchronous orbit on 27 August 2014 during an intense substorm with AE(max) similar to 1000 nT. THEMIS-D (TH-D) was located inside geosynchronous orbit around midnight in the interval from 09: 25 to 09:55UT. During this period, two distinct magnetic dipolarizations with tailward ion flows are observed by TH-D. The first one is indicated by the magnetic elevation angle increase from 15 to 25 degrees around 09:30:40 UT. The tailward perpendicular velocity is V-perpendicular to x similar to -50 km s(-1). The second one is presented by the elevation angle increase from 25 to 45 degrees around 09:36 UT, and the tailward perpendicular velocity is V-perpendicular to x similar to -70 km s(-1). These two significant dipolarizations are accompanied with the sharp increase in the energy flux of energetic electron inside geosynchronous orbit. After a 5 min expansion of the near-Earth plasma sheet (NEPS), THEMIS-E (TH-E) located outside geosynchronous orbit also detected this tailward expanding plasma sheet with ion flows of -150 km s(-1). The dipolarization propagates tailward with a speed of -47 km s(-1) along a 2.2 R-E distance in the X direction between TH-D and TH-E within 5 min. These dipolarizations with tailward ion flows observed inside geosynchronous orbit indicate a new energy transfer path in the inner magnetosphere during substorms.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7019
Collection空间科学部
Recommended Citation
GB/T 7714
Sun, Xiaoying,Liu, Weining William,Duan, Suping. Magnetic dipolarizations inside geosynchronous orbit with tailward ion flows[J]. ANNALES GEOPHYSICAE,2019,37(3):289-297.
APA Sun, Xiaoying,Liu, Weining William,&Duan, Suping.(2019).Magnetic dipolarizations inside geosynchronous orbit with tailward ion flows.ANNALES GEOPHYSICAE,37(3),289-297.
MLA Sun, Xiaoying,et al."Magnetic dipolarizations inside geosynchronous orbit with tailward ion flows".ANNALES GEOPHYSICAE 37.3(2019):289-297.
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