arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2111.09019astro-ph.SR
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由日冕shock wave触发的多线程日珥振荡

Multi-threaded prominence oscillations triggered by a coronal shock wave

V. Jerčić, R. Keppens, Y. Zhou

摘要:

在这项工作中,我们研究的因果关系之间的局部能量释放和远程突出振荡,突出有一个现实的线状结构。我们使用了一个开源的磁流体动力学(MHD)代码MPI-AMRVAC来创建一个多线程的突出体。我们引入了一个额外的能量源,激波由此产生,从而引起日珥振荡。我们研究了两种情况下,不同的源振幅,以分析其对振荡的影响。我们的结果表明,经常使用的钟摆模型不足以完全估计日珥振荡的周期,除了显示的源和线状日珥结构的影响需要考虑。初始冲击波的反复反射和透射发生在域内多个高温高密度梯度的特定位置。这包括位于磁弓足点的左右过渡区(TR),以及日珥和日冕之间的各种过渡区(PCTR)。这导致了压缩波的大量干扰。它们对振荡的回复力有贡献,导致周期偏离预期的摆模型,此外还导致归因阻尼的差异或甚至各种线程之间振幅的增长。伴随着由激波冲击引起的全球纵向运动,小尺度横向振荡也很明显。多个高频振荡代表磁声波的传播。我们看到的阻尼与能量的转换及其与周围日冕的交换有关。我们的模拟演示了不同线程之间的能量交换及其不同的振荡模式。

英文摘要:

In this work, we study the causal relations between a localised energy release and a remote prominence oscillation, where the prominence has a realistic thread-like structure. We used an open source magnetohydrodynamic (MHD) code known as MPI-AMRVAC to create a multithreaded prominence body. We introduced an additional energy source from which a shock wave originates, thereby inducing prominence oscillation. We studied two cases with different source amplitudes to analyze its effect on the oscillations. Our results show that the frequently used pendulum model does not suffice to fully estimate the period of the prominence oscillation, in addition to showing that the influence of the source and the thread-like prominence structure needs to be taken into account. Repeated reflections and transmissions of the initial shock wave occur at the specific locations of multiple high-temperature and high-density gradients in the domain. This includes the left and right transition region (TR) located at the footpoints of the magnetic arcade, as well as the various transition regions between the prominence and the corona (PCTR). This results in numerous interferences of compressional waves. They contribute to the restoring forces of the oscillation, causing the period to deviate from the expected pendulum model, in addition to leading to differences in attributed damping or even growth in amplitude between the various threads. Along with the global longitudinal motion that result from the shock impact, small-scale transverse oscillations are also evident. Multiple high-frequency oscillations represent the propagation of magnetoacoustic waves. The damping we see is linked to the conversion of energy and its exchange with the surrounding corona. Our simulations demonstrate the exchange of energy between different threads and their different modes of oscillation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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