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题名: Formation and Properties of Tangential Discontinuities in Three-dimensional Compressive MHD Turbulence
作者: Yang, Liping; Zhang, Lei; He, Jiansen; Tu, Chuanyi; Li, Shengtai; Wang, Xin; Wang, Linghua
作者部门: 空间科学部
通讯作者: He, JS (reprint author), Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China. ; He, JS (reprint author), HIT Inst Space Sci & Appl Technol, Shenzhen 518055, Peoples R China.
关键词: magnetohydrodynamics (MHD) ; methods: numerical ; solar wind ; turbulence
刊名: ASTROPHYSICAL JOURNAL
ISSN号: 0004-637X
出版日期: 2017
卷号: 851, 期号:2, 页码:121
收录类别: SCI
项目资助者: NSFC [41774157, 41474147, 41231069, 41574168, 41421003, 41204105] ; National Young Talent Support Program of China
英文摘要: In this study, we investigate the formation and properties of tangential discontinuities (TDs) in compressive magnetohydrodynamic (MHD) turbulence. By detecting sharp interfaces of magnetic and thermal pressure, TDs are seen to separate distinct plasma and magnetic field regions, behaving as the walls of different flux tubes. Across an identified TD, the temperature, with an enhancement, experiences an evident variation. The temporal evolution of its 3D structure indicates that the mutual approaching, squeezing, and separating of two clumps of the turbulent results in the formation and collapse of the identified TD, with its lifetime of about 4.5 hr for typical solar wind parameters. Through isolating each of the formed TDs from the background, and tracking each of them through time, it is found that the TDs display a multiscale nature. Their length can be as long as 2.50 L-0, their width comes to an average of about 0.16 L-0, their volume has a maximum of about 0.01 L-0(3), and, for most of the TDs, the energy dissipative rate is below 0.51 rho(0) V-A(3)/L-0 0, with L-0, rho(0), and VA being characteristic length, characteristic density, and characteristic Alfven speed. The lifetimes of the TDs extend from about 0.16 L-0/V-A to about 2.20 L-0/V-A, with fewer TDs surviving longer lifetimes. For typical solar wind parameters, their lifetimes are far shorter than the time the solar wind takes from the Sun to 1 au, which indicates that TDs observed by in situ satellites at 1 au are more likely to be generated by local turbulence.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6120
Appears in Collections:空间科学部_期刊论文

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