Numerical experiments of various types of disturbances in the low and middle corona caused by solar eruptions
Numerical experiments of various types of disturbances in the low and middle corona caused by solar eruptions
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太阳喷发引起的中低日冕各类扰动的数值实验
DOI：
10.1093/mnras/stz2576
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发表时间：
2019-12
影响因子：
4.8
通讯作者：
Jun Lin
中科院分区：
文献类型：
--
作者：
Xiaoyan Xie;Jun Lin
基于太阳喷发的灾变模型，我们通过数值实验探索太阳喷发引起的扰动，特别关注大尺度波浪。除了之前的作品所展示的现象之外，还看到了一种称为等离子体堆积的新结构。当破坏性的磁结构向外移动时，在它前面会产生快速模式激波。快速模式激波在向前传播时横向扩展并演变成新月形状。最终新月形的两端接触底部边界并在激波后面引起各种类型的扰动，包括激波回波。由回波后面的等离子体积聚产生的等离子体堆积区域与此相关。这是一个全新的现象，以前没有报道过。堆积区域的两个特征引起了我们的注意：首先，其距底部边界的高度与某些极紫外（EUV）波的高度相似；其次，其速度约为沿大气低层的快模激波速度的三分之一，这被认为是莫顿波前的位置。这表明堆积也可能是 EUV 波的来源。根据我们的数值结果，我们还合成了不同波段的“观测到的”太阳动力学天文台（SDO）大气成像组件（AIA）图像。结果表明，不同波段“观测”到的EUV波的特征确实不同，这在一定意义上与EUV波的真实观测结果一致。
Based on the catastrophe model of the solar eruption, we explore the disturbances caused by solar eruptions via numerical experiments, with special attention given to large-scale waves. In addition to the phenomena shown by previous works, a new structure known as the plasma pile-up is also seen. As the disrupting magnetic structure moves outwards, a fast-mode shock is driven ahead of it. The fast-mode shock expands sideways when propagating forward and evolves to a crescent shape. Eventually the two ends of the crescent touch the bottom boundary and cause various types of disturbance behind the shock, including a shock echo. A plasma pile-up region produced by plasma accumulation behind the echo is associated with this. This is a brand new phenomenon that was not reported previously. Two features of the pile-up region draw our attention: first, its height from the bottom boundary is similar to that of some extreme ultraviolet (EUV) waves and second, its velocity is about one-third of the velocity of the fast-mode shock along the low layer of the atmosphere, which is believed to be the location of the Moreton wavefront. This suggests that the pile-up may be a source of EUV waves as well. According to our numerical results, we also synthesize the 'observed' Solar Dynamics Observatory (SDO) Atmospheric Imaging Assembly (AIA) images in different wavebands. The results demonstrate that the characteristics of the EUV waves 'observed' in different bands are indeed different, which is consistent with the true observational results regarding EUV waves in a certain sense.
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影响因子：
2
作者：
Z. Mei;J. Lin
通讯作者：
Z. Mei;J. Lin
DOI：
10.1086/519013
发表时间：
2007-04
期刊：
The Astrophysical Journal
影响因子：
--
作者：
M. Wills-Davey;Craig E. DeForest;J. O. Stenflo;J. O. Stenflo
通讯作者：
M. Wills-Davey;Craig E. DeForest;J. O. Stenflo;J. O. Stenflo
DOI：
10.1086/427739
发表时间：
2005-03
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Y. Mok;Z. Mikić;R. Lionello;J. Linker
通讯作者：
Y. Mok;Z. Mikić;R. Lionello;J. Linker
影响因子：
2.8
作者：
Nitta, N. V.;Aschwanden, M. J.;Wuelser, J. -P.
通讯作者：
Wuelser, J. -P.
影响因子：
1.9
作者：
M. Aschwanden
通讯作者：
M. Aschwanden