The Dynamic Structure of Coronal Hole Boundaries
The Dynamic Structure of Coronal Hole Boundaries
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DOI：
10.3847/1538-4357/ac69ed
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发表时间：
2022-05
期刊：
影响因子：
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通讯作者：
V. Aslanyan;D. Pontin;R. Scott;A. Higginson;P. Wyper;S. Antiochos
中科院分区：
文献类型：
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作者：
V. Aslanyan;D. Pontin;R. Scott;A. Higginson;P. Wyper;S. Antiochos
太阳冕洞的边界很难在观测上唯一地定义，但部分原因是缓慢的太阳风似乎起源于那里。本文的目的是探讨在不同类型的冕洞边界，即流光和伪流光的交换磁重联的动力学及其对日冕结构的影响。我们描述了合成观测来自三维磁流体动力学模拟的太阳大气中的冕洞边界被干扰的流动，模仿太阳超颗粒。我们的分析表明，交换重联更容易发生在冕洞的伪流光边界。结果，与冕洞边界的高度扭曲的头盔-流光部分相比，由伪流光形成的冕洞边界的部分保持平滑得多。我们的研究结果产生了重要的新的见解冕洞边界区域，这是至关重要的耦合日冕的日光层作为缓慢的太阳风的形成区域。
The boundaries of solar coronal holes are difficult to uniquely define observationally but are sites of interest in part because the slow solar wind appears to originate there. The aim of this article is to explore the dynamics of interchange magnetic reconnection at different types of coronal hole boundaries—namely streamers and pseudostreamers—and their implications for the coronal structure. We describe synthetic observables derived from three-dimensional magnetohydrodynamic simulations of the atmosphere of the Sun in which coronal hole boundaries are disturbed by flows that mimic the solar supergranulation. Our analysis shows that interchange reconnection takes place much more readily at the pseudostreamer boundary of the coronal hole. As a result, the portion of the coronal hole boundary formed by the pseudostreamer remains much smoother, in contrast to the highly distorted helmet-streamer portion of the coronal hole boundary. Our results yield important new insights on coronal hole boundary regions, which are critical in coupling the corona to the heliosphere as the formation regions of the slow solar wind.