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较小尺度磁螺旋线管相互作用的数值研究
Alternative TitleNumerical Research About Interaction Between Two Tube Models Containing Spiral Magnetic Field Lines With a Little Small Length-Scale
叶占银; 北京8701信箱
Department空间天气学国家重点实验室
Source Publication空间科学学报
2008
Volume28Issue:3Pages:194-202
ISSN0254-6124
Language中文
Keyword太阳风 日冕物质抛射 mhd方程组
Abstract在子午面内,偶极子场和六极子场适当叠加得到势磁场,势磁场与太阳风长时间相互作用得到特殊的冕流背景结构.在这种背景结构下,两个较小尺度的磁螺旋线管模型能够连续浮入到计算域,在计算域内相互作用,触发了日冕物质抛射(CME).在数值模拟这一过程时,较小尺度的磁螺旋线管模型具有同心厕形磁场结构,模型中心等离子压强与边界压强之比m=2,模型的半径分别取为a=0.07Rs和a=0.1Rs(Rs为太阳半径).在这两种情况下,得到了两种典型的计算结果.当a=0.07Rs时,两个磁螺旋线管模型相互作用,在7Rs内融合成一个磁螺旋线管模型,向外传播;当a=0.1Rs时,两个磁螺旋线管模型相瓦作用,作为一个整体向外传播,在计算域内没有融合到一起,基本上保持各自的磁场结构.
Other AbstractAfter a long time interaction, governed by the magneto by drodynamic (MHD) equations,between the Parker solar wind flow and a potential magnetic field combined by a dipole and a hexapole,a special streamer background structure in the solar meridian plane is presented.With the background structure,two tube models containing spiral magnetic field lines with a small length-scale can move in the computational domain step by step, interact afterward and trigger a Coronal Mass Ejection (CME) finally.The tube model is approached by a structure made up of two-dimensional co-circular magnetic field lines, with a ratio of the plasma pressure at its.center to that at its edge m=2 and with a radius a for two cases:a=0.07 RS (Rs is the solar radius) and a=0.1 RS respectively. Corresponding to the two cases,two typical numerical results are obtained.In the case a=0.07 Rg,the two tube models interact with each other, merge into one set of co-circular magnetic field lines in seven solar radii and propagate outward.In the other case a=0.1 Re,the two tube models do not merge into one and keep two sets of co-circular magnetic field lines exist in the computational domain during their propagation as a whole.
Indexed ByCSCD
Funding Project中国科学院空间科学与应用研究中心
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1386
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
叶占银,北京8701信箱. 较小尺度磁螺旋线管相互作用的数值研究[J]. 空间科学学报,2008,28(3):194-202.
APA 叶占银,&北京8701信箱.(2008).较小尺度磁螺旋线管相互作用的数值研究.空间科学学报,28(3),194-202.
MLA 叶占银,et al."较小尺度磁螺旋线管相互作用的数值研究".空间科学学报 28.3(2008):194-202.
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