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Models for the motions of flare loops and ribbons
Lin J(林隽); FORBES, TG; PRIEST, ER; BUNGEY, TN; LIN, J
发表期刊SOLAR PHYSICS
1995-07
卷号159期号:2页码:275-299
DOI10.1007/BF00686534
产权排序第1完成单位
收录类别SCI
摘要We have found a conformal mapping which is valid for any magnetic boundary condition at the photosphere and which can be used to determine the evolution of an open, two-dimensional magnetic field configuration as it relaxes to a closed one. Solutions obtained with this mapping are in quasi-static equilibrium, and they contain a vertical current sheet and have line-tied boundary conditions. As a specific example, we determine the solution for a boundary condition corresponding to a submerged, two-dimensional dipole below the photosphere. We assume that the outer edges of the hottest X-ray loops correspond to field lines mapping from the outer edges of the H alpha ribbon to the lower tip of the current sheet where field lines reconnect at a Y-type neutral line which rises with time. The cooler H alpha loops are assumed to lie along the field lines mapping to the inner edges of the flare ribbons. With this correspondence between the plasma structures and the magnetic field we determine the shrinkage that field lines are observed to undergo as they are disconnected from the neutral line. During the early phase of the flare, we predict that shrinkage inferred from the height of the H alpha and X-ray loops is close to 100% of the loop height. However, the shrinkage should rapidly decrease with time to values on the order of 20% by the late phase. We also predict that the shrinkage in very large loops obeys a universal scaling law which is independent of the boundary condition, provided that the field becomes self-similar (i.e., all field lines have the same shape) at large distances. Specifically, for any self-similar field containing a Y-type neutral line, the observed shrinkage at large distances should decrease as (Delta X/X(R))(-2/3), where Delta X is the ribbon width and X(R) is the ribbon separation. Finally, we discuss the relation between the electric field at the neutral line and the motions of the flare loops and ribbons.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0038-0938
URL查看原文
WOS记录号WOS:A1995RN23600005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]RECONNECTION ; CORONA
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6019
专题太阳物理研究组
通讯作者LIN, J
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Lin J,FORBES, TG,PRIEST, ER,et al. Models for the motions of flare loops and ribbons[J]. SOLAR PHYSICS,1995,159(2):275-299.
APA 林隽,FORBES, TG,PRIEST, ER,BUNGEY, TN,&LIN, J.(1995).Models for the motions of flare loops and ribbons.SOLAR PHYSICS,159(2),275-299.
MLA 林隽,et al."Models for the motions of flare loops and ribbons".SOLAR PHYSICS 159.2(1995):275-299.
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