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SHEAR-INDUCED INSTABILITY AND ARCH FILAMENT ERUPTION - A MAGNETOHYDRODYNAMIC (MHD) NUMERICAL-SIMULATION
WU, ST; SONG, MT; MARTENS, PCH; DRYER, M
1991-08-01
Source PublicationSOLAR PHYSICS
ISSN0038-0938
Volume134Issue:2Pages:353-377
AbstractWe 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).
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordFREE MAGNETIC-FIELDS ; LOWER SOLAR ATMOSPHERE ; EULERIAN FICE SCHEME ; WAVE MOTIONS ; INDUCED MASS ; EVOLUTION ; ARCADE ; FLARES ; FLOWS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:A1991FZ91700009
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8559
Collection期刊(老文献)
Affiliation1.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
Recommended Citation
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.
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