On the Fast Propagating Ultra-hot Disturbance Captured by SDO/AIA: An In-depth Insight into the Coronal Nonlinear Dynamics
On the Fast Propagating Ultra-hot Disturbance Captured by SDO/AIA: An In-depth Insight into the Coronal Nonlinear Dynamics
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SDO/AIA 捕获的快速传播超热扰动：深入洞察日冕非线性动力学
DOI：
10.3847/2041-8213/aba128
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Ake Zhao
中科院分区：
文献类型：
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作者：
Hongbo Li;Hengqiang Feng;Yu Liu;Yu;eng Shen;Zhanjun Tian;Guoqing Zhao;Ake Zhao
脉冲加热事件及其对应的非线性动力学一直是太阳大气物理学中最难理解的物理过程之一。这些进程的复杂性，加上有限的观察，极大地阻碍了我们对它们的理解。在这里，我们首次给出了一个闭合的冕环或环段中的非线性声波的明确例子，它看起来像是一个快速传播的超热扰动，在一个具有高度演化的辐射强度分布的不可区分的日冕环中凝聚在一起。基于非线性波传播理论，我们认为这种类型的观测可以为扰动在传播过程中提供进一步的信息。根据这一信息，我们得出结论，传播的非线性扰动可以通过稀疏波快速加热日冕，在我们的观测中不应该发生扰动诱导的磁重联。此外，还给出了扰动诱导重联机制存在的一个简便判据。所有这些都为我们提供了一个新的视角来理解伴随而来的太阳脉冲加热事件的非线性动力学，这不仅可以解释日冕加热和热冕环的快速形成等问题，而且还可以为我们提供一种非常新颖和有前景的诊断日冕等离子体性质的地震学方案。
The impulsive heating events and their corresponding nonlinear dynamics remain one of the most obscure physical processes in solar atmospheric physics. The complicacy of these processes together with limited observations have greatly hampered our understanding of them. Here, we present, for the first time, an unambiguous example of a nonlinear acoustic wave in a closed coronal loop or loop segment, which appeared as a fast propagating ultra-hot disturbance cohesively in an indistinguishable corona loop with a highly evolving emission intensity profile. Based on the theory of propagating nonlinear waves, we argue that this type of observation can provide further information for the disturbance during its propagation. With this information, we conclude that the propagating nonlinear disturbance can quickly heat the corona through the rarefaction wave, and the disturbance-induced magnetic reconnection should not happen in our observation. Besides, a convenient criterion has also been deduced for the existence of the disturbance-induced reconnection mechanism. All of this provides us with a new insight into the accompanying nonlinear dynamics of solar impulsive heating events, which can not only shed light on problems including coronal heating and the fast formation of hot coronal loops, but also show us a very novel and prospective seismology scheme for the diagnosis of coronal plasma properties.