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Title: Fully kinetic large-scale simulations of the collisionless magnetorotational instability
Authors: Inchingolo, G.
Grismayer, T.
Loureiro, N. F.
Fonseca, R. A.
Silva, L. O.
Keywords: Accretion
Accretion disks
Agnetic reconnection
Issue Date: 2018
Publisher: IOP Publishing Ltd
Abstract: We present two-dimensional particle-in-cell simulations of the fully kinetic collisionless magnetorotational instability (MRI) in weakly magnetized (high ?) pair plasma. The central result of this numerical analysis is the emergence of a self-induced turbulent regime in the saturation state of the collisionless MRI, which can only be captured for large enough simulation domains. One of the underlying mechanisms for the development of this turbulent state is the drift-kink instability (DKI) of the current sheets resulting from the nonlinear evolution of the channel modes. The onset of the DKI can only be observed for simulation domain sizes exceeding several linear MRI wavelengths. The DKI and ensuing magnetic reconnection activate the turbulent motion of the plasma in the late stage of the nonlinear evolution of the MRI. At steady-state, the magnetic energy has an MHD-like spectrum with a slope of k ?5/3 for k? < 1 and k ?3 for sub-Larmor scale (k? > 1). We also examine the role of the collisionless MRI and associated magnetic reconnection in the development of pressure anisotropy. We study the stability of the system due to this pressure anisotropy, observing the development of mirror instability during the early-stage of the MRI. We further discuss the importance of magnetic reconnection for particle acceleration during the turbulence regime. In particular, consistent with reconnection studies, we show that at late times the kinetic energy presents a characteristic slope of epsilon ?2 in the high-energy region.
Peer reviewed: yes
DOI: 10.3847/1538-4357/aac0f2
ISSN: 0004-637X
Accession number: WOS:000434264500003
Appears in Collections:CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica

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