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Title: Role of Ion Kinetic Physics in the Interaction of Magnetic Flux Ropes

Journal Article · · Physical Review Letters

To explain many natural magnetized plasma phenomena, it is crucial to understand how rates of collisionless magnetic reconnection scale in large magnetohydrodynamic (MHD) scale systems. Simulations of isolated current sheets conclude such rates are independent of system size and can be reproduced by the Hall-MHD model, but neglect sheet formation and coupling to MHD scales. Here in this study, it is shown for the problem of flux-rope merging, which includes this formation and coupling, that the Hall-MHD model fails to reproduce the kinetic results. The minimum sufficient model must retain ion kinetic effects, which set the ion diffusion region geometry and give time-averaged rates that reduce significantly with system size, leading to different global evolution in large systems.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1457252
Alternate ID(s):
OSTI ID: 1224134
Report Number(s):
LA-UR-15-25385; PRLTAO; TRN: US1901335
Journal Information:
Physical Review Letters, Vol. 115, Issue 17; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (4)

Simulations of anti-parallel reconnection using a nonlocal heat flux closure journal August 2017
Study of magnetic reconnection in large-scale magnetic island coalescence via spatially coupled MHD and PIC simulations journal August 2018
Plasma Energization in Colliding Magnetic Flux Ropes journal October 2018
Why does steady-state magnetic reconnection have a maximum local rate of order 0.1? text January 2016

Figures / Tables (6)


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