EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Electron acceleration in small-size magnetic holes

Ji Liu1,2, Shutao Yao2, Quanqi Shi2, Xiaogang Wang3, Qiugang Zong4, Yongyong Feng1, Han Liu4, Ruilong Guo5, Zhonghua Yao5, Jonathan Iain Rae6, Alexander William Degeling2, Anmin Tian2, and Lloyd Woodham6
Ji Liu et al.
  • 1National Space Science Center, Chinese Academy of Sciences, State Key Laboratory of Space Weather, China (
  • 2Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
  • 3Department of Physics, Harbin Institute of Technology, Harbin 150001, China
  • 4School of Earth and space Sciences, Peking University
  • 5Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 10029, China
  • 6Mullard Space Science Laboratory, University College London

The magnetic-to-particle energy conversion is one of the most fundamental physics processes to laboratory, space and astrophysical contexts. Adiabatic acceleration processes in moderate varying environment merely play significant roles to generate devastating cosmic rays and spectacular aurorae, etc. More commonly, when the violent variation or strongly inhomogeneity in electromagnetic field distorts the trajectory of the particles, non-adiabatic acceleration processes function more transiently and drastically on particle energization trigger explosive phenomena like sudden solar flares. However, without high-resolution simultaneous measurements on plasma and field at previous space missions, the small/fast scale of the non-adiabatic processes make it difficult to be analyzed to reach a comprehensive understanding to most of the underlying non-adiabatic acceleration mechanisms in space and astrophysical contexts. Here, using MMS data with unprecedented high temporal resolutions, we report such finding of acceleration for electrons trapped in a kinetic-size magnetic holes which at the same time is the acceleration region, and demonstrate the validity of the acceleration process by numerical simulation, achieving the reproduction for the observation.

How to cite: Liu, J., Yao, S., Shi, Q., Wang, X., Zong, Q., Feng, Y., Liu, H., Guo, R., Yao, Z., Rae, J. I., Degeling, A. W., Tian, A., and Woodham, L.: Electron acceleration in small-size magnetic holes, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-2719,, 2020

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