The shape of twisted, line-tied coronal loops
The shape of twisted, line-tied coronal loops
复制标题
扭曲的线状冠状环的形状
DOI：
10.1007/bf00156270
复制
发表时间：
1989
期刊：
影响因子：
2.8
通讯作者：
A. Hood
中科院分区：
文献类型：
--
作者：
P. K. Browning;A. Hood
本文研究了日冕环对光球足点缓慢扭转的静磁平衡响应。一个数值代码是用来解决全非线性2-D轴对称问题，延长较早的线性化模型，假设弱扭转和大展弦比。人们发现，往往是环的核心往往会收缩到一个区域的强纵向场，而外部扩展。它示出，远离光球足点，平衡是非常好的近似由直的1-D圆柱模型。这个想法是用来开发一个简单的方法，规定的足点角位移和计算的平衡。
The magnetostatic equilibrium of a coronal loop in response to slow twisting of the photospheric footpoints is investigated. A numerical code is used to solve the full non-linear 2-D axisymmetric problem, extending earlier linearised models which assume weak twist and large aspect ratio. It is found that often the core of the loop tends to contract into a region of strong longitudinal field while the outer part expands. It is shown that, away from the photospheric footpoints, the equilibrium is very well approximated by a straight 1-D cylindrical model. This idea is used to develop a simple method for prescribing the footpoint angular displacement and calculating the equilibrium.