Electron acceleration behind a wavy dipolarization front |
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| Authors: | Mingyu Wu Quanming Lu Martin Volwerk Rumi Nakamura Tielong Zhang |
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| Institution: | 1.Harbin Institute of Technology,Shenzhen,China;2.CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Science,University of Science and Technology of China,Hefei,China;3.Space Research Institute,Austrian Academy of Science,Graz,Austria |
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| Abstract: | In this paper, with the in-situ observations from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) probes we report a wavy dipolarization front (DF) event, where the DF has different magnetic structures and electron distributions at different \(y\) positions in the Geocentric Solar Magnetospheric (GSM) coordinates. At \(y \sim2.1R_{E}\) (\(R_{E}\) is the radius of Earth), the DF has a relatively simple structure, which is similar to that of a conventional DF. At \(y \sim3.0R_{E}\), the DF is revealed to have a multiple DF structure, where the plasma exhibits a vortex flow. Such a wavy DF could be the results of the interchange instability. The different structure of such a wavy DF at different sites has a great effect on electron acceleration. Fermi acceleration can occur at the site of the DF with a simple or multiple DF structure, while betatron acceleration as a local process has the contribution to energetic electrons only at the site of the DF with a simple structure. |
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