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

Jonathan Ng, Yi Min Huang, Ammar Hakim, A. Bhattacharjee, Adam Stanier, William Daughton, Liang Wang, Kai Germaschewski

Research output: Contribution to journalArticle

20 Scopus citations

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. Recently, 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.

Original languageEnglish (US)
Article number112104
JournalPhysics of Plasmas
Volume22
Issue number11
DOIs
StatePublished - Nov 1 2015

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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