Formation and Initiation of Erupting Flux Rope and Embedded Filament Driven by Photospheric Converging Motion

	Formation and Initiation of Erupting Flux Rope and Embedded Filament Driven by Photospheric Converging Motion
	Zhao, Xiaozhou; Xia, Chun; Keppens, Rony; Gan, Weiqun
刊名	ASTROPHYSICAL JOURNAL
	2017
卷号	841 期号:2 页码:106-
英文摘要	In this paper, we study how a flux rope (FR) is formed and evolves into the corresponding structure of a coronal mass ejection (CME) numerically driven by photospheric converging motion. A two-and-a-half-dimensional magnetohydrodynamics simulation is conducted in a chromosphere-transition-corona setup. The initial arcade-like linear force-free magnetic field is driven by an imposed slow motion converging toward the magnetic inversion line at the bottom boundary. The convergence brings opposite-polarity magnetic flux to the polarity inversion, giving rise to the formation of an FR by magnetic reconnection and eventually to the eruption of a CME. During the FR formation, an embedded prominence gets formed by the levitation of chromospheric material. We confirm that the converging flow is a potential mechanism for the formation of FRs and a possible triggering mechanism for CMEs. We investigate the thermal, dynamical, and magnetic properties of the FR and its embedded prominence by tracking their thermal evolution, analyzing their force balance, and measuring their kinematic quantities. The phase transition from the initiation phase to the acceleration phase of the kinematic evolution of the FR was observed in our simulation. The FR undergoes a series of quasi-static equilibrium states in the initiation phase; while in the acceleration phase the FR is driven by Lorentz force and the impulsive acceleration occurs. The underlying physical reason for the phase transition is the change of the reconnection mechanism from the Sweet-Parker to the unsteady bursty regime of reconnection in the evolving current sheet underneath the FR.
语种	英语
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/17444]
专题	中国科学院紫金山天文台
推荐引用方式 GB/T 7714	Zhao, Xiaozhou,Xia, Chun,Keppens, Rony,et al. Formation and Initiation of Erupting Flux Rope and Embedded Filament Driven by Photospheric Converging Motion[J]. ASTROPHYSICAL JOURNAL,2017,841(2):106-.
APA	Zhao, Xiaozhou,Xia, Chun,Keppens, Rony,&Gan, Weiqun.(2017).Formation and Initiation of Erupting Flux Rope and Embedded Filament Driven by Photospheric Converging Motion.ASTROPHYSICAL JOURNAL,841(2),106-.
MLA	Zhao, Xiaozhou,et al."Formation and Initiation of Erupting Flux Rope and Embedded Filament Driven by Photospheric Converging Motion".ASTROPHYSICAL JOURNAL 841.2(2017):106-.