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Effects of plasma beta on the plasmoid instability
Ni L(倪蕾)1,2; Ziegler, U3; Huang, YM4; Lin J(林隽)1; Mei ZX(梅志星)1; Ni, L (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Kunming 650011, Peoples R China.
发表期刊PHYSICS OF PLASMAS
2012-07
卷号19期号:7
DOI10.1063/1.4736993
产权排序第1完成单位
收录类别SCI ; EI
摘要The effects of the initial upstream plasma beta on the plasmoid instability are studied via two-dimensional resistive magnetohydrodynamic simulations. For cases with nonuniform beta dependent initial plasma mass density and uniform temperature, our numerical results indicate that the critical Lundquist number for onset of the plasmoid instability depends on the initial plasma beta. The critical Lundquist number is approximately 2000 - 3000 for beta = 50 and is 8000 - 10000 for beta = 0.2. The higher the beta, the smaller the critical Lundquist number is. Similar to previous studies of high-beta systems, the average reconnection rate in low beta systems is found to become weakly dependent on the Lundquist number in the plasmoid-unstable regime. However, the average reconnection rate, normalized to the asymptotic value of upstream BVA, is lower in a low beta system than that in a high beta system. The magnetic energy spectral index, which characterizes fragmentation of the reconnection layer, is approximately two and is insensitive to beta in the high-Lunquist number regime. It is also found that the magnetic reconnection rate becomes similar for different beta cases, if the initial force-balance is provided by temperature gradient instead of density gradient. Therefore, it is concluded that the beta-dependence mentioned above may be largely attributed to the density variation.
项目资助者Key Laboratory of Solar Activity [KLSA2011-09] ; Applied Basic Research of Yunnan Province in China [2011FB113] ; NSFC [11147131] ; CAS [KJCX2-EW-T07]
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2012-09-28
WOS记录号WOS:000307422800080
WOS研究方向Physics
WOS类目Physics, Fluids & Plasmas
关键词[WOS]CURRENT-LAYER FRAGMENTATION ; CURRENT SHEETS ; CASCADING RECONNECTION
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6198
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.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
3.Leibniz-Institut für Astrophysik Potsdam, DE 14482 Potsdam, Germany
4.Space Science Center, University of New Hampshire, Durham, New Hampshire 03824, USA
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Ni L,Ziegler, U,Huang, YM,et al. Effects of plasma beta on the plasmoid instability[J]. PHYSICS OF PLASMAS,2012,19(7).
APA Ni L,Ziegler, U,Huang, YM,Lin J,Mei ZX,&Ni, L .(2012).Effects of plasma beta on the plasmoid instability.PHYSICS OF PLASMAS,19(7).
MLA Ni L,et al."Effects of plasma beta on the plasmoid instability".PHYSICS OF PLASMAS 19.7(2012).
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