用Hinode/SOT和SST/CRISP对日冕雨的一次锐利观察
A Sharp Look at Coronal Rain with Hinode/SOT and SST/CRISP
摘要：
热带的智慧，当它是热的和密集的，我们可以期待雨可能也适用于太阳。事实上，观测和数值模拟已经表明，环足点的强烈加热，就像活跃区域的情况一样，使它们的日冕脱离热平衡，这可能导致一种被称为灾难性冷却的现象。在日冕中的局部压力损失之后，热等离子体在这些环中局部冷凝，并急剧冷却到色球温度。这些斑点在H-α和Ca II H中以分钟的时间尺度变得明亮，它们的动力学似乎更多地受到环中内部压力变化的影响，而不是重力。因此，它们成为磁场的追踪者，这导致了壮观的日冕雨，被观察到沿着日冕环落下。在这项工作中，我们报告的日冕雨的高分辨率观测与太阳光学望远镜（SOT）日出和CRISP在瑞典太阳望远镜（SST）。进行统计研究，其中属性，如速度和加速度的日冕雨的推导。我们展示了这种现象如何构成循环内部物理条件的诊断工具。此外，我们还分析了环状下落的日冕雨中的线状凝聚的横向振荡，并讨论了这种波的可能性质。这表明了日冕雨在日冕加热和日冕地震学领域中的重要作用。
英文摘要：
The tropical wisdom that when it is hot and dense we can expect rain might also apply to the Sun. Indeed, observations and numerical simulations have shown that strong heating at footpoints of loops, as is the case for active regions, puts their coronae out of thermal equilibrium, which can lead to a phenomenon known as catastrophic cooling. Following local pressure loss in the corona, hot plasma locally condenses in these loops and dramatically cools down to chromospheric temperatures. These blobs become bright in H-alpha and Ca II H in time scales of minutes, and their dynamics seem to be subject more to internal pressure changes in the loop rather than to gravity. They thus become trackers of the magnetic field, which results in the spectacular coronal rain that is observed falling down coronal loops. In this work we report on high resolution observations of coronal rain with the Solar Optical Telescope (SOT) on Hinode and CRISP at the Swedish Solar Telescope (SST). A statistical study is performed in which properties such as velocities and accelerations of coronal rain are derived. We show how this phenomenon can constitute a diagnostic tool for the internal physical conditions inside loops. Furthermore, we analyze transverse oscillations of strand-like condensations composing coronal rain falling in a loop, and discuss the possible nature of the wave. This points to the important role that coronal rain can play in the fields of coronal heating and coronal seismology.
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