霍尔磁流体力学中的三维等离子体介导的重联和湍流

IF 2 3区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS
Yi-Min Huang, Amitava Bhattacharjee
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引用次数: 0

摘要

等离子体不稳定性通过在二维(2D)范围内将层状再连接层转化为由次级电流片连接的无数等离子体,以及在三维(3D)范围内促进自生湍流再连接,从而加速碰撞等离子体中的再连接。在大尺度天体物理和空间系统中,质点不稳定性很可能始于碰撞机制,但随着电流片的破碎向动力学尺度发展,可能会过渡到无碰撞机制。霍尔磁流体动力学(MHD)模型被广泛认为是碰撞再连接向无碰撞再连接过渡的一种简化但有效的表示方法。然而,二维霍尔 MHD 模拟中的质点不稳定性往往会导致单 X 线再连接构造,这与全动力学粒子-胞室模拟结果有很大不同。本研究表明,与二维相比,单X线再连接在三维中发生的可能性较小。此外,根据伦奎斯特数和系统大小与动力学尺度之间的比例,霍尔 MHD 也可以实现三维自生湍流重联。我们分析了自生湍流状态的特征,包括能量功率谱和湍流涡各向异性的尺度依赖性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Three-dimensional plasmoid-mediated reconnection and turbulence in Hall magnetohydrodynamics
Plasmoid instability accelerates reconnection in collisional plasmas by transforming a laminar reconnection layer into numerous plasmoids connected by secondary current sheets in two dimensions (2D) and by fostering self-generated turbulent reconnection in three dimensions (3D). In large-scale astrophysical and space systems, plasmoid instability likely initiates in the collisional regime but may transition into the collisionless regime as the fragmentation of the current sheet progresses toward kinetic scales. Hall magnetohydrodynamics (MHD) models are widely regarded as a simplified yet effective representation of the transition from collisional to collisionless reconnection. However, plasmoid instability in 2D Hall MHD simulations often leads to a single-X-line reconnection configuration, which significantly differs from fully kinetic particle-in-cell simulation results. This study shows that single-X-line reconnection is less likely to occur in 3D compared to 2D. Moreover, depending on the Lundquist number and the ratio between the system size and the kinetic scale, Hall MHD can also realize 3D self-generated turbulent reconnection. We analyze the features of the self-generated turbulent state, including the energy power spectra and the scale dependence of turbulent eddy anisotropy.
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来源期刊
Physics of Plasmas
Physics of Plasmas 物理-物理:流体与等离子体
CiteScore
4.10
自引率
22.70%
发文量
653
审稿时长
2.5 months
期刊介绍: Physics of Plasmas (PoP), published by AIP Publishing in cooperation with the APS Division of Plasma Physics, is committed to the publication of original research in all areas of experimental and theoretical plasma physics. PoP publishes comprehensive and in-depth review manuscripts covering important areas of study and Special Topics highlighting new and cutting-edge developments in plasma physics. Every year a special issue publishes the invited and review papers from the most recent meeting of the APS Division of Plasma Physics. PoP covers a broad range of important research in this dynamic field, including: -Basic plasma phenomena, waves, instabilities -Nonlinear phenomena, turbulence, transport -Magnetically confined plasmas, heating, confinement -Inertially confined plasmas, high-energy density plasma science, warm dense matter -Ionospheric, solar-system, and astrophysical plasmas -Lasers, particle beams, accelerators, radiation generation -Radiation emission, absorption, and transport -Low-temperature plasmas, plasma applications, plasma sources, sheaths -Dusty plasmas
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