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ISSN  2096-3955

CN  10-1502/P

Citation: BoJing Zhu, Hui Yan, David A Yuen, YaoLin Shi, 2019: Electron acceleration in interaction of magnetic islands in large temporal-spatial turbulent magnetic reconnection, Earth and Planetary Physics. doi: 10.26464/epp2019003

doi: 10.26464/epp2019003


Electron acceleration in interaction of magnetic islands in large temporal-spatial turbulent magnetic reconnection


Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China


Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, China


National Supercomputer Center in Guangzhou, Sun Yat-sen University, Guangzhou 510006, China


Department of Earth Science and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis 55455, USA


Applied Physics and Applied Mathematics Department, Columbia University, New York 10027, USA


Key Laboratory of Computing Geodynamics, Chinese Academy of Sciences, Beijing 100049, China


College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: BoJing Zhu,

Received Date: 2018-06-12
Web Publishing Date: 2019-12-01

A new combined Fermi, betatron, and turbulent electron acceleration mechanism is proposed in interaction of magnetic islands during turbulent magnetic reconnection evolution in explosive astrophysical phenomena at large temporal-spatial scale (LTSTMR), the ratio of observed current sheets thickness to electron characteristic length, electron Larmor radius for low-β and electron inertial length for high-β, is on the order of 1010–1011; the ratio of observed evolution time to electron gyroperiod is on the order of 107–109). The original combined acceleration model is known to be one of greatest importance in the interaction of magnetic islands; it assumes that the continuous kinetic-dynamic temporal-spatial scale evolution occurs as two separate independent processes. In this paper, we reconsider the combined acceleration mechanism by introducing a kinetic-dynamic-hydro full-coupled model instead of the original micro-kinetic or macro-dynamic model. We investigate different acceleration mechanisms in the vicinity of neutral points in magnetic islands evolution, from the stage of shrink and breakup into smaller islands (kinetic scale), to the stage of coalescence and growth into larger islands (dynamic scale), to the stages of constant and quasi-constant (contracting-expanding) islands (hydro scale). As a result, we give for the first time the acceleration efficiencies of different types of acceleration mechanisms in magnetic islands’ interactions in solar atmosphere LTSTMR activities (pico-, 10–2–105 m; nano-, 105–106 m; micro-, 106–107 m; macro-, 107–108 m; large-, 108–109 m).

Key words: hybrid particle acceleration mechanism, large temporal-spatial turbulent magnetic reconnection, Hydro-Dynamic-Kinetic model

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Electron acceleration in interaction of magnetic islands in large temporal-spatial turbulent magnetic reconnection

BoJing Zhu, Hui Yan, David A Yuen, YaoLin Shi