SHEAR-INDUCED INSTABILITY AND ARCH FILAMENT ERUPTION - A MAGNETOHYDRODYNAMIC (MHD) NUMERICAL-SIMULATION

	SHEAR-INDUCED INSTABILITY AND ARCH FILAMENT ERUPTION - A MAGNETOHYDRODYNAMIC (MHD) NUMERICAL-SIMULATION
	WU, ST ; SONG, MT ; MARTENS, PCH ; DRYER, M
刊名	SOLAR PHYSICS
	1991-08-01
卷号	134 期号:2 页码:353-377
ISSN号	0038-0938
英文摘要	We investigate, via a two-dimensional (nonplanar) MHD simulation, a situation wherein a bipolar magnetic field embedded in a stratified solar atmosphere (i.e., arch-filament-like structure) undergoes symmetrical shear motion at the footpoints. It was found that the vertical plasma flow velocities grow exponentially leading to a new type of global MHD-instability that could be characterized as a 'Dynamic Shearing Instability', with a growth rate of about square-root 8 VBAR(A)a, where VBAR(A) is the average Alfven speed and a-1 is the characteristic length scale. The growth rate grows almost linearly until it reaches the same order of magnitude as the Alfven speed. Then a nonlinear MHD instability occurs beyond this point. This simulation indicates the following physical consequences: the central loops are pinched by opposing Lorentz forces, and the outer closed loops stretch upward with the vertically-rising mass flow. This instability may apply to arch filament eruptions (AFE) and coronal mass ejections (CMEs).
学科主题	天文和天体物理
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	FREE MAGNETIC-FIELDS ; LOWER SOLAR ATMOSPHERE ; EULERIAN FICE SCHEME ; WAVE MOTIONS ; INDUCED MASS ; EVOLUTION ; ARCADE ; FLARES ; FLOWS
收录类别	SCI
语种	英语
WOS记录号	WOS:A1991FZ91700009
公开日期	2013-02-05
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8559]
专题	紫金山天文台_期刊（老文献）
作者单位	1.HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138 2.LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304 3.NOAA,SPACE ENVIRONM LAB,BOULDER,CO 80303 4.PURPLE MT OBSERV,NANJING,PEOPLES R CHINA
推荐引用方式 GB/T 7714	WU, ST,SONG, MT,MARTENS, PCH,et al. SHEAR-INDUCED INSTABILITY AND ARCH FILAMENT ERUPTION - A MAGNETOHYDRODYNAMIC (MHD) NUMERICAL-SIMULATION[J]. SOLAR PHYSICS,1991,134(2):353-377.
APA	WU, ST,SONG, MT,MARTENS, PCH,&DRYER, M.(1991).SHEAR-INDUCED INSTABILITY AND ARCH FILAMENT ERUPTION - A MAGNETOHYDRODYNAMIC (MHD) NUMERICAL-SIMULATION.SOLAR PHYSICS,134(2),353-377.
MLA	WU, ST,et al."SHEAR-INDUCED INSTABILITY AND ARCH FILAMENT ERUPTION - A MAGNETOHYDRODYNAMIC (MHD) NUMERICAL-SIMULATION".SOLAR PHYSICS 134.2(1991):353-377.