On the role of system size in Hall MHD magnetic reconnection

Abstract

We study the effects of the Hall electric field on magnetic island coalescence in the large island limit and find evidence for both a elongated electron current sheet layer with a Sweet-Parker-like reconnection rate and a collapsed, Petschek-like electron sheet with a peak reconnection rate approaching the 0.1 vA B0 Hall MHD rate. The state observed in our simulations appears to depend on grid scale. Furthermore, even at the largest system sizes, we find that flux-pileup effects cause the islands to "bounce" despite the presence of a collapsed current sheet allowing for fast instantaneous reconnection. The average reconnection rate in the large island limit is slow though the peak reconnection rate is fast.

Submitted to PRL; 5 pages, 7 figures

References in corpus (7)

• Instability of current sheets and formation of plasmoid chains
• Two-scale structure of the electron dissipation region during collisionless magnetic reconnection
• A catastrophe model for fast magnetic reconnection onset
• General Theory of the Plasmoid Instability
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Cited by in corpus (4)

• Magneto-thermal evolution of neutron stars with coupled Ohmic, Hall and ambipolar effects via accurate finite-volume simulations
• A Simflowny-based high-performance 3D code for the generalized induction equation
• Effect of In-Plane Shear Flow on the Magnetic Island Coalescence Instability
• Scaling of reconnection parameters in magnetic island coalescence: Role of in-plane shear flow