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Journal Articles Geophysical Research Letters Year : 2016

Two-scale ion meandering caused by the polarization electric field during asymmetric reconnection

Shan Wang
Li-Jen Chen
  • Function : Author
Michael Hesse
  • Function : Author
Naoki Bessho
  • Function : Author
Daniel J. Gershman
  • Function : Author
John Dorelli
  • Function : Author
Barbara Giles
  • Function : Author
Roy B. Torbert
  • Function : Author
Craig J. Pollock
  • Function : Author
Robert Strangeway
  • Function : Author
Robert E. Ergun
  • Function : Author
James L. Burch
  • Function : Author
Levon Avanov
  • Function : Author
Thomas E. Moore
  • Function : Author
Yoshifumi Saito

Abstract

Ion velocity distribution functions (VDFs) from a particle-in-cell simulation of asymmetric reconnection are investigated to reveal a two-scale structure of the ion diffusion region (IDR). Ions bouncing in the inner IDR are trapped mainly by the electric field normal to the current sheet (N direction), while those reaching the outer IDR are turned back mainly by the magnetic force. The resulting inner layer VDFs have counter-streaming populations along N with decreasing counter-streaming speeds away from the midplane while maintaining the out-of-plane speed, and the outer layer VDFs exhibit crescent shapes toward the out-of-plane direction. Observations of the above VDF features and the normal electric fields provide evidence for the two-scale meandering motion.
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insu-03669453 , version 1 (17-05-2022)

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Shan Wang, Li-Jen Chen, Michael Hesse, Naoki Bessho, Daniel J. Gershman, et al.. Two-scale ion meandering caused by the polarization electric field during asymmetric reconnection. Geophysical Research Letters, 2016, 43, pp.7831-7839. ⟨10.1002/2016GL069842⟩. ⟨insu-03669453⟩
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