Structure of the Electron Distribution Function and Induced Beam Instability in Collisionless Magnetic Reconnection with a Strong Guide Field

• SHIMOMURA Kazuya

  Department of Physics, Nagoya University

• WATANABE Tomohiko

  Department of Physics, Nagoya University

• MAEYAMA Shinya

  Department of Physics, Nagoya University

• ISHIZAWA Akihiro

  Graduate School of Energy Science, Kyoto University

Abstract

A phase space structure of the electron distribution function is investigated by the gyrokinetic theory and numerical simulations to investigate a possible mechanism of the excitation of the beam instability which induces collisionless magnetic reconnection in a strong guide field. It is shown that the perturbed electron distribution function develops in proportion to the shifted Maxwellian distribution as the reconnection electric field accelerates electrons along the guide field at the X-point, with parity symmetry around the z- axis. The accelerated electrons are expected to excite the kinetic Alfvén waves (KAWs) when the beam velocity exceeds the Alfvén speed. The obtained results suggest a possible scenario for anomalous resistivity generation in the case with the strong guide field where the beam electrons accelerated at the X-point lose their parallel momentum through interactions with the self-excited KAWs.

Journal

• Plasma and Fusion Research

  Plasma and Fusion Research 15 (0), 1401084-1401084, 2020-11-19

  The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

• magnetic reconnection
• gyrokinetic simulation
• kinetic Alfvén wave
• beam instability
• anomalous instability
• collisionless reconnection

Details

• CRID: 1391412326424466304
• NII Article ID: 130007948936
• DOI: 10.1585/pfr.15.1401084
• ISSN: 18806821
• Web Site: https://www.jstage.jst.go.jp/article/pfr/15/0/15_1401084/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed