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Title: The island coalescence problem: Scaling of reconnection in extended fluid models including higher-order moments

Abstract

As modeling of collisionless magnetic reconnection in most space plasmas with realistic parameters is beyond the capability of today's simulations, due to the separation between global and kinetic length scales, it is important to establish scaling relations in model problems so as to extrapolate to realistic scales. Furthermore, large scale particle-in-cell simulations of island coalescence have shown that the time averaged reconnection rate decreases with system size, while fluid systems at such large scales in the Hall regime have not been studied. Here, we perform the complementary resistive magnetohydrodynamic (MHD), Hall MHD, and two fluid simulations using a ten-moment model with the same geometry. In contrast to the standard Harris sheet reconnection problem, Hall MHD is insufficient to capture the physics of the reconnection region. Additionally, motivated by the results of a recent set of hybrid simulations which show the importance of ion kinetics in this geometry, we evaluate the efficacy of the ten-moment model in reproducing such results.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [2];  [2]; ORCiD logo [3]; ORCiD logo [3]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of New Hampshire, Durham, NH (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1256589
Alternate Identifier(s):
OSTI ID: 1225250
Report Number(s):
PPPL-5187
Journal ID: ISSN 1070-664X; PHPAEN
Grant/Contract Number:  
AGS-1056898; AGS-138944; AGS-14606169; PHY-1229408; NNX13AK31G; AC02-05CH11231; AC02-09CH11466; SC0006670; DESC0006670
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 11; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; mediated magnetic reconnection; collisionless reconnection; current; sheets; instability; simulations; antiparallel; transition; equations; hybrid; fields; magnetohydrodynamics; particle-in-cell method; electrical resistivity; tensor methods; magnetic islands

Citation Formats

Ng, Jonathan, Huang, Yi -Min, Hakim, Ammar, Bhattacharjee, A., Stanier, Adam, Daughton, William, Wang, Liang, and Germaschewski, Kai. The island coalescence problem: Scaling of reconnection in extended fluid models including higher-order moments. United States: N. p., 2015. Web. doi:10.1063/1.4935302.
Ng, Jonathan, Huang, Yi -Min, Hakim, Ammar, Bhattacharjee, A., Stanier, Adam, Daughton, William, Wang, Liang, & Germaschewski, Kai. The island coalescence problem: Scaling of reconnection in extended fluid models including higher-order moments. United States. doi:https://doi.org/10.1063/1.4935302
Ng, Jonathan, Huang, Yi -Min, Hakim, Ammar, Bhattacharjee, A., Stanier, Adam, Daughton, William, Wang, Liang, and Germaschewski, Kai. Thu . "The island coalescence problem: Scaling of reconnection in extended fluid models including higher-order moments". United States. doi:https://doi.org/10.1063/1.4935302. https://www.osti.gov/servlets/purl/1256589.
@article{osti_1256589,
title = {The island coalescence problem: Scaling of reconnection in extended fluid models including higher-order moments},
author = {Ng, Jonathan and Huang, Yi -Min and Hakim, Ammar and Bhattacharjee, A. and Stanier, Adam and Daughton, William and Wang, Liang and Germaschewski, Kai},
abstractNote = {As modeling of collisionless magnetic reconnection in most space plasmas with realistic parameters is beyond the capability of today's simulations, due to the separation between global and kinetic length scales, it is important to establish scaling relations in model problems so as to extrapolate to realistic scales. Furthermore, large scale particle-in-cell simulations of island coalescence have shown that the time averaged reconnection rate decreases with system size, while fluid systems at such large scales in the Hall regime have not been studied. Here, we perform the complementary resistive magnetohydrodynamic (MHD), Hall MHD, and two fluid simulations using a ten-moment model with the same geometry. In contrast to the standard Harris sheet reconnection problem, Hall MHD is insufficient to capture the physics of the reconnection region. Additionally, motivated by the results of a recent set of hybrid simulations which show the importance of ion kinetics in this geometry, we evaluate the efficacy of the ten-moment model in reproducing such results.},
doi = {10.1063/1.4935302},
journal = {Physics of Plasmas},
number = 11,
volume = 22,
place = {United States},
year = {2015},
month = {11}
}

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Cited by: 11 works
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