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Effects of the non-uniform initial environment and the guide field on the plasmoid instability
Ni L(倪蕾)1; Lin J(林隽)1,2; Murphy, NA2; Ni, L (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Kunming 650011, Peoples R China.
发表期刊PHYSICS OF PLASMAS
2013-06
卷号20期号:6
DOI10.1063/1.4811144
产权排序第1完成单位
收录类别SCI ; EI
摘要Effects of non-uniform initial mass density and temperature on the plasmoid instability are studied via 2.5-dimensional resistive magnetohydrodynamic (MHD) simulations. Our results indicate that the development of the plasmoid instability is apparently prevented when the initial plasma density at the center of the current sheet is higher than that in the upstream region. As a result, the higher the plasma density at the center and the lower the plasma beta in the upstream region, the higher the critical Lundquist number needed for triggering secondary instabilities. When beta = 0.2, the critical Lundquist number is higher than 10(4). For the same Lundquist number, the magnetic reconnection rate is lower for the lower plasma beta case. Oppositely, when the initial mass density is uniform and the Lundquist number is low, the magnetic reconnection rate turns out to be higher for the lower plasma beta case. For the high Lundquist number case (>10(4)) with uniform initial mass density, the magnetic reconnection is not affected by the initial plasma beta and the temperature distribution. Our results indicate that the guide field has a limited impact on the plasmoid instability in resistive MHD. (C) 2013 AIP Publishing LLC.
项目资助者NSFC [11147131] ; NSFY [11203069] ; 973 program [2013CBA01503] ; CAS [KJCX2-EW-T07] ; Yunnan Province [2011FB113] ; NSF SHINE grant [AGS-1156076]
语种英语
学科领域Physics
文章类型Article
ISSN1070-664X
URL查看原文
归档日期2013-09-13
WOS记录号WOS:000321273200008
WOS研究方向Physics
WOS类目Physics, Fluids & Plasmas
关键词[WOS]RECONNECTING CURRENT SHEETS ; MAGNETIC RECONNECTION ; SECONDARY ISLANDS ; ACCELERATION ; FLARES
引用统计
被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6231
专题太阳物理研究组
通讯作者Ni, L (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Kunming 650011, Peoples R China.
作者单位1.Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
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GB/T 7714
Ni L,Lin J,Murphy, NA,et al. Effects of the non-uniform initial environment and the guide field on the plasmoid instability[J]. PHYSICS OF PLASMAS,2013,20(6).
APA Ni L,Lin J,Murphy, NA,&Ni, L .(2013).Effects of the non-uniform initial environment and the guide field on the plasmoid instability.PHYSICS OF PLASMAS,20(6).
MLA Ni L,et al."Effects of the non-uniform initial environment and the guide field on the plasmoid instability".PHYSICS OF PLASMAS 20.6(2013).
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