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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2018-128
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2018-128
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 22 Nov 2018

Regular paper | 22 Nov 2018

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Annales Geophysicae (ANGEO) and is expected to appear here in due course.

Magnetic dipolarizations inside geosynchronous orbit with tailward ions flow

Xiaoying Sun1,2, Weining William Liu1, and Suping Duan1 Xiaoying Sun et al.
  • 1State Key Laboratory of Space Weather, National Space Science Center (NSSC), Chinese Academy of Sciences (CAS), Beijing, 100190, China
  • 2University of Chinese Academy of Sciences, Beijing, 100049, China

Abstract. Electromagnetic field and plasma data from the Time History of Events and Macroscale Interactions duringSubstorms (THEMIS) near-Earth probes are used to investigate magnetic dipolarizations inside geosynchronous orbit on 27 August 2014 during an intense substorm with AEmax ~ 1000 nT. THEMIS-D (TH-D) was located inside geosynchronous orbit around midnight in the interval from 09:25 UT to 09:55 UT. During this period two distinct magnetic dipolarizations with tailward ions flow are observed by TH-D. The first one is displayed by magnetic elevation angle increase from 15 degree to 25 degree around 09:30:40 UT. The tailward perpendicular velocity is V⟂x ~ −50 km/s. The second one is presented by the elevation angle increase from 25 degree to 45 degree around 09:36 UT. And the tailward perpendicular velocity is V⟂x ~ −70 km/s. These two significant dipolarizations are accompanied with the sharp increase in the energy flux of energetic electron inside geosynchronous. After 5 min expanding of near-Earth plasma sheet (NEPS), THEMIS-E (TH-E) located outside geosynchronous orbit also detects this tailward expanding plasma sheet with ion flow −150 km/s. The dipolarization propagates tailward with speed −47 km/s, along 2.2 RE distance in the X direction between TH-D and TH-E within 5 min. These dipolarizations with tailward ions flow observed inside geosynchronous orbit indicate new energy transfer path in the inner magnetosphere during substorms.

Xiaoying Sun et al.
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Status: closed
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Xiaoying Sun et al.
Xiaoying Sun et al.
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