渐衰光桥中的反常振荡模式
Abnormal oscillation modes in a waning light bridge
摘要：
太阳黑子就像一个波导，响应太阳内部的动力学;捕获的波和振荡可以揭示它的热和磁结构。我们研究了光桥侵入太阳黑子的振荡现象，这些振荡的细节可以揭示黑子磁拓扑的精细结构。利用太阳动力学天文台/大气成像组件的观测数据，分析了不同温度下光桥等离子体发射强度的振荡，并研究了它们的空间分布。极紫外辐射强度在5分钟和亚分钟范围内呈现两种持续振荡。五分钟振荡的空间分布遵循桥的脊柱;而亚分钟振荡与桥的两侧重叠。此外，亚分钟振荡在空间域中是高度相关的，然而，振荡的东，西两侧的滞后时间是不对称的。与此同时，类似喷流的活动仅在东侧发现。在颗粒光桥的两侧发现了振荡图案和喷射状活动\textbf{are}形式的不对称性。基于我们的研究和最近的发现，我们提出了一个新的光桥扭曲磁场模型及其与太阳黑子磁场的动力学相互作用。
英文摘要：
A sunspot acts as a waveguide in response to the dynamics of the solar interior; the trapped waves and oscillations could reveal its thermal and magnetic structures. We study the oscillations in a sunspot intruded by a light bridge, the details of the oscillations could reveal the fine structure of the magnetic topology. We use the Solar Dynamics Observatory/Atmospheric Imaging Assembly data to analyse the oscillations in the emission intensity of light bridge plasma at different temperatures and investigate their spatial distributions. The extreme ultraviolet emission intensity exhibits two persistent oscillations at five-minute and sub-minute ranges. The spatial distribution of the five-minute oscillation follows the spine of the bridge; whereas the sub-minute oscillations overlap with two flanks of the bridge. Moreover, the sub-minute oscillations are highly correlated in spatial domain, however, the oscillations at the eastern and western flanks are asymmetric with regard to the lag time. In the meanwhile, jet-like activities are only found at the eastern flank. Asymmetries in forms of oscillatory pattern and jet-like activities \textbf{are} found between two flanks of a granular light bridge. Based on our study and recent findings, we propose a new model of twisted magnetic field for a light bridge and its dynamic interactions with the magnetic field of a sunspot.
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