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The plasmoid instability during asymmetric inflow magnetic reconnection
Murphy, NA1; Young, AK1,2; Shen CC(沈呈彩)1,3,4; Lin J(林隽)1,3; Ni L(倪蕾)3
Source PublicationPHYSICS OF PLASMAS
2013-06
Volume20Issue:6
DOI10.1063/1.4811470
Contribution Rank第3完成单位
Indexed BySCI ; EI
Abstract

Theoretical studies of the plasmoid instability generally assume that the reconnecting magnetic fields are symmetric. We relax this assumption by performing two-dimensional resistive magnetohydrodynamic simulations of the plasmoid instability during asymmetric inflow magnetic reconnection. Magnetic asymmetry modifies the onset, scaling, and dynamics of this instability. Magnetic islands develop preferentially into the weak magnetic field upstream region. Outflow jets from individual X-points impact plasmoids obliquely rather than directly as in the symmetric case. Consequently, deposition of momentum by the outflow jets into the plasmoids is less efficient, the plasmoids develop net vorticity, and shear flow slows down secondary merging between islands. Secondary merging events have asymmetry along both the inflow and outflow directions. Downstream plasma is more turbulent in cases with magnetic asymmetry because islands are able to roll around each other after exiting the current sheet. As in the symmetric case, plasmoid formation facilitates faster reconnection for at least small and moderate magnetic asymmetries. However, when the upstream magnetic field strengths differ by a factor of 4, the reconnection rate plateaus at a lower value than expected from scaling the symmetric results. We perform a parameter study to investigate the onset of the plasmoid instability as a function of magnetic asymmetry and domain size. There exist domain sizes for which symmetric simulations are stable but asymmetric simulations are unstable, suggesting that moderate magnetic asymmetry is somewhat destabilizing. We discuss the implications for plasmoid and flux rope formation in solar eruptions, laboratory reconnection experiments, and space plasmas. The differences between symmetric and asymmetric simulations provide some hints regarding the nature of the three-dimensional plasmoid instability. 

Funding ProjectNASA[NNX09AB17G] ; NASA[NNX11AB61G] ; NASA[NNX12AB25G] ; NASA[NNM07AB07C] ; NSF SHINE[AGS-1156076] ; NSF-REU solar physics program at the Center for Astrophysics[ATM-0851866]
Funding OrganizationNASA[NNX09AB17G, NNX11AB61G, NNX12AB25G, NNM07AB07C] ; NSF SHINE[AGS-1156076] ; NSF-REU solar physics program at the Center for Astrophysics[ATM-0851866]
Language英语
Subject Area物理学 ; 等离子体物理学 ; 天文学 ; 天体物理学 ; 等离子体天体物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherAMER INST PHYSICS
Publication PlaceCIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
ISSN1070-664X
URL查看原文
WOS IDWOS:000321273200013
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas
WOS KeywordEJECTION CURRENT SHEETS ; CORONAL MASS EJECTIONS ; SOLAR-FLARES ; TEARING INSTABILITY ; NUMERICAL EXPERIMENTS ; DAYSIDE MAGNETOPAUSE ; DENSITY ASYMMETRY ; SIMULATION ; ERUPTION ; MODE
EI Accession Number20132916503932
EI KeywordsMagnetoplasma
EI Classification Number615.3 Magnetohydrodynamics (MHD) Power Generation - 631.1 Fluid Flow, General - 701.2 Magnetism: Basic Concepts and Phenomena
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6230
Collection太阳物理研究组
Corresponding AuthorMurphy, NA
Affiliation1.Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA
2.Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
3.Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, Yunnan 650011, China
4.Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
Recommended Citation
GB/T 7714
Murphy, NA,Young, AK,Shen CC,et al. The plasmoid instability during asymmetric inflow magnetic reconnection[J]. PHYSICS OF PLASMAS,2013,20(6).
APA Murphy, NA,Young, AK,Shen CC,Lin J,&Ni L.(2013).The plasmoid instability during asymmetric inflow magnetic reconnection.PHYSICS OF PLASMAS,20(6).
MLA Murphy, NA,et al."The plasmoid instability during asymmetric inflow magnetic reconnection".PHYSICS OF PLASMAS 20.6(2013).
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