Evolution of the Kippenhahn–Schlüter Prominence Model Magnetic Field under Cowling Resistivity
Evolution of the Kippenhahn–Schlüter Prominence Model Magnetic Field under Cowling Resistivity
复制标题
整流罩电阻率下 Kippenhahn-Schlüter 日珥模型磁场的演化
DOI：
10.1093/pasj/62.5.1231
复制
发表时间：
2010
影响因子：
2.3
通讯作者：
H. Isobe
中科院分区：
文献类型：
--
作者：
Andrew Hillier;K. Shibata;H. Isobe
我们提出的结果从1.5D扩散模拟的Kippenhahn-Schlutter日珥模型磁场演化的影响下的双极条款的Cowling电阻率。我们表明，最初的演变是由水平和垂直磁场的比例，这使得电流片变薄（增厚）时，这个比例是大（小）和一个边缘的情况下，形成一个新的特征电流片长度尺度。在大于Cowling电阻率时间的时间跨度之后，电流片变厚为独立于场强度的比率的t$的幂律。这些结果表明，当水平场与垂直场之比小于20%时，Cowling电阻率的加入使日珥撕裂不稳定性时间尺度减小了一个数量级以上，说明Cowling电阻率在日珥的整个生命周期中可以显著地改变日珥的结构，并且在某些情况下将允许发生撕裂不稳定性。
We present the results from 1.5D diffusion simulations of the Kippenhahn-Schlueter prominence model magnetic field evolution under the influence of the ambipolar terms of Cowling resistivity. We show that initially the evolution is determined by the ratio of the horizontal and vertical magnetic fields, which gives current sheet thinning (thickening) when this ratio is large (small) and a marginal case where a new characteristic current sheet length scale is formed. After a timespan greater than the Cowling resistivity time, the current sheet thickens as a power law of $t$ independent of the ratio of the field strengths. These results imply that when Cowling resistivity is included in the model, the tearing instability time scale is reduced by more than one order of magnitude when the ratio of the horizontal field to the vertical field is 20\% or less. These results imply that, over the course of its lifetime, the structure of the prominence can be significantly altered by Cowling resistivity, and in some cases will allow the tearing instability to occur.
DOI：
10.1088/0004-637x/705/2/1183
发表时间：
2009
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Arber T
通讯作者：
Arber T