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Marginally stable current sheets in collisionless magnetic reconnection

C. Granier1,2,*, D. Borgogno2, L. Comisso3, D. Grasso2, E. Tassi1, and R. Numata4

  • 1Université Côte d'Azur, CNRS, Observatoire de la Côte d'Azur, Laboratoire J. L. Lagrange, Boulevard de l'Observatoire, CS 34229, 06304 Nice Cedex 4, France
  • 2Istituto dei Sistemi Complessi - CNR and Dipartimento di Energia, Politecnico di Torino, Torino 10129, Italy
  • 3Department of Astronomy and Columbia Astrophysics Laboratory, Columbia University, New York, New York 10027, USA
  • 4Graduate School of Information Science, University of Hyogo, Kobe 650-0047, Japan

  • *camille.granier@oca.eu
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Phys. Rev. E 106, L043201 – Published 21 October, 2022

DOI: https://doi.org/10.1103/PhysRevE.106.L043201

Abstract

Noncollisional current sheets that form during the nonlinear development of spontaneous magnetic reconnection are characterized by a small thickness, of the order of the electron skin depth. They can become unstable to the formation of plasmoids, which allows the magnetic reconnection process to reach high reconnection rates. In this work, we investigate the marginal stability conditions for the development of plasmoids when the forming current sheet is purely collisionless and in the presence of a strong guide field. We analyze the geometry that characterizes the reconnecting current sheet, and what promotes its elongation. Once the reconnecting current sheet is formed, we identify the regimes for which it is plasmoid unstable. Our study shows that plasmoids can be obtained, in this context, from current sheets with an aspect ratio much smaller than in the collisional regime, and that the plasma flow channel of the marginally stable current layers maintains an inverse aspect ratio of 0.1.

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Outline

Information

Phys. Rev. E 106, L043201– Published 21 October, 2022
  • Received 9 June 2022
  • Accepted 27 September 2022
Article part of CHORUS
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