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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
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.

资助项目Key Laboratory of Solar Activity [KLSA2011-09] ; Applied Basic Research of Yunnan Province in China [2011FB113] ; NSFC [11147131] ; CAS [KJCX2-EW-T07]
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
学科领域物理学 ; 等离子体物理学
学科门类理学 ; 理学::天文学
文章类型Article
出版者AMER INST PHYSICS
出版地CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
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
引用统计
被引频次:47[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/114a53/6198
专题太阳物理研究组
通讯作者Ni L(倪蕾)
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
第一作者单位中国科学院云南天文台
通讯作者单位中国科学院云南天文台
推荐引用方式
GB/T 7714
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.(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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