On the Frequency Drift of Coronal Loop’s Fast Kink Oscillation: Effects of Quasi-static Evolution in Loop Density
On the Frequency Drift of Coronal Loop’s Fast Kink Oscillation: Effects of Quasi-static Evolution in Loop Density
复制标题
日冕环快速扭结振荡的频率漂移：环密度准静态演化的影响
DOI：
10.3847/1538-4357/ac32bf
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Yan Zhao
中科院分区：
文献类型：
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作者：
Hongbo li;Hengqiang Feng;Yu;eng Shen;Zhanjun Tian;Guoqing Zhao;Ake Zhao;Yan Zhao
尽管快扭结振荡作为日冕地震学中为数不多的几个基本振型之一，在过去的二十年里受到了广泛的关注，但对其频率漂移的观测仍然很少。有证据表明，这种现象与环路密度的准静态演化有关。因此，我们解析地考虑了准静态密度演化对日冕环快扭结振荡的影响。通过这些分析，我们明确地确定了振荡周期/频率和振幅对振荡回路演化密度的解析依赖关系。这些发现可以很好地调和一些频率漂移观测中的几个关键特征，这些特征是不被理解的。还建立了热力学回路中快速扭结振荡的模型，以更详细地研究当前的影响。我们的发现不仅为日冕环快扭结振荡的频率漂移提供了可能的解释，而且还提供了一种全新的能量转换机制，在这种机制下，振荡日冕环内能和动能可以通过环的振荡及其密度演化的相互作用直接交换，这可能为空间磁等离子体中与热力学谐振器相关的能量过程提供新的线索。
Although the fast kink oscillation, as one of a few fundamental modes in coronal seismology, has received a lot of attention over the past two decades, observations of its frequency drift remain elusive. There is evidence that this phenomenon is related to the quasi-static evolution of loop density. We therefore consider analytically the effects of a quasi-static density evolution on the fast kink oscillation of coronal loops. From the analyses, we determine explicitly the analytic dependence of the oscillation period/frequency and amplitude on the evolving density of the oscillatory loop. The findings can well reconcile several key characters in some frequency drift observations, which are not understood. Models of fast kink oscillation in the thermal dynamic loop are also established to investigate the present effects in more detail. Our findings not only show us a possible explanation for the frequency drift of the coronal loop’s fast kink oscillation, but also a full new energy transformation mechanism where the internal energy and the kinetic energy of an oscillating coronal loop can be interchanged directly by the interaction of the loop’s oscillation and its density evolution, which we suggest may provide a new clue for the energy processes associated with a thermodynamic resonator in the space magnetic plasma.