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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.
Source PublicationPHYSICS OF PLASMAS
Contribution Rank第1完成单位
Indexed BySCI ; EI
AbstractThe 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.
Funding OrganizationKey Laboratory of Solar Activity [KLSA2011-09] ; Applied Basic Research of Yunnan Province in China [2011FB113] ; NSFC [11147131] ; CAS [KJCX2-EW-T07]
Subject AreaPhysics
Archive Date2012-09-28
WOS IDWOS:000307422800080
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas
Citation statistics
Cited Times:35[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorNi, L (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Kunming 650011, Peoples R China.
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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,&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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