Numerical study for the bursty nature of spontaneous fast reconnection

	Numerical study for the bursty nature of spontaneous fast reconnection
	Hu YQ(呼延奇) ; Feng XS(冯学尚)
刊名	Solar Physics
	2006
卷号	238 期号:2 页码:329-345
关键词	fast magnetic reconnection current-sheet system computer resistivity evolution dynamics model mhd simulation
ISSN号	0038-0938
通讯作者	北京8701信箱
英文摘要	In this paper, spontaneous fast reconnection in a neutral current sheet, which is initially perturbed by a localized resistivity, is studied by the newly developed Space-Time Conservation Element and Solution Element (CESE) method. After the initial perturbation is switched off, an anomalous resistivity is allowed to occur if a threshold of the local electron-ion drift velocity is exceeded. For a given threshold value, the amount of the reconnected magnetic flux introduced by the initial perturbation is very crucial for the onset of the anomalous resistivity. The numerical results indicate that fast reconnection can develop self-consistently with slow shocks extending between the diffusion region and a large-scale plasmoid-like structure, which is pushed forward by the reconnection outflow. A Petschek-like configuration is then built up, but it can not be sustained as a quasi-steady state. In fact, during the reconnection evolution, the diffusion region undergoes an elongation process so that after the dynamic process is nonlinearly saturated secondary tearing is subject to occur at the center of the system. This leads to enhanced and time-dependent reconnection. The reconnection evolution is further studied in various physical situations, also confirming the bursty nature of the spontaneous fast reconnection mechanism.
学科主题	空间物理
收录类别	SCI
原文出处	http://www.springerlink.com/content/0785663jg01m73v0/fulltext.pdf
语种	英语
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/1062]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Hu YQ,Feng XS. Numerical study for the bursty nature of spontaneous fast reconnection[J]. Solar Physics,2006,238(2):329-345.
APA	呼延奇,&冯学尚.(2006).Numerical study for the bursty nature of spontaneous fast reconnection.Solar Physics,238(2),329-345.
MLA	呼延奇,et al."Numerical study for the bursty nature of spontaneous fast reconnection".Solar Physics 238.2(2006):329-345.