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Title: On the value of the reconnection rate

Numerical simulations have consistently shown that the reconnection rate in certain collisionless regimes can be fast, of the order of $$0.1v_{A}B_{u}$$, where$$v_{A}$$and$$B_{u}$$are the Alfven speed and the reconnecting magnetic field upstream of the ion diffusion region. This particular value has been reported in myriad numerical simulations under disparate conditions. But, despite decades of research, the reasons underpinning this specific value remain mysterious. We present an overview of this problem and discuss the conditions under which the '0.1 value' is attained. Finally, we explain why this problem should be interpreted in terms of the ion diffusion region length.
Authors:
ORCiD logo [1] ; ORCiD logo [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States). Dept. of Astrophysical Sciences and Princeton Physics Lab.
Publication Date:
Grant/Contract Number:
AC02-09CH-11466.
Type:
Accepted Manuscript
Journal Name:
Journal of Plasma Physics
Additional Journal Information:
Journal Volume: 82; Journal Issue: 06; Journal ID: ISSN 0022-3778
Publisher:
Cambridge University Press
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; astrophysical plasmas; plasma nonlinear phenomena; space plasma physics; high-temperature plasmas; collisionless magnetic reconnection; impulsive; reconnection; current sheets; fields; dynamics
OSTI Identifier:
1353403