Effects of the non-uniform initial environment and the guide field on the plasmoid instability

	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, NA 2
刊名	PHYSICS OF PLASMAS
	2013-06
卷号	20 期号:6
ISSN号	1070-664X
通讯作者	Ni, L (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	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.
学科主题	Physics
类目[WOS]	Physics, Fluids & Plasmas
研究领域[WOS]	Physics
关键词[WOS]	RECONNECTING CURRENT SHEETS ; MAGNETIC RECONNECTION ; SECONDARY ISLANDS ; ACCELERATION ; FLARES
收录类别	SCI ; EI
原文出处	http://scitation.aip.org/content/aip/journal/pop/20/6/10.1063/1.4811144
语种	英语
WOS记录号	WOS:000321273200008
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6231]
专题	云南天文台_太阳物理研究组
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
推荐引用方式 GB/T 7714	Ni L,Lin J,Murphy, NA. 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.(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).