Automated Swirl Detection Algorithm (ASDA) and Its Application to Simulation and Observational Data
Automated Swirl Detection Algorithm (ASDA) and Its Application to Simulation and Observational Data
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DOI：
10.3847/1538-4357/aabd34
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发表时间：
2018-04
期刊：
影响因子：
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通讯作者：
Jiajia Liu;C. Nelson;R. Erdélyi
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文献类型：
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作者：
Jiajia Liu;C. Nelson;R. Erdélyi
近年来，太阳大气中的涡旋运动被广泛观测到，并被认为在能量从光球层进入日冕的通道中起着关键作用。在这里，我们提出了一个新开发的自动涡流检测算法（ASDA），并讨论其应用。ASDA被发现非常擅长在各种噪声水平的合成数据中检测漩涡，这意味着我们随后的科学结果是精明的。将ASDA应用于由Hinode上的太阳光学望远镜采样的像素大小为39.2公里的光球观测，表明光球中的漩涡总数为1.62 × 105个，平均半径和旋转速度分别为1.290 km和<1.0 km s-1。通过对Bifrost MHD数值模拟中探测到的涡旋与地面和星载观测结果的比较表明：（1）数据的空间分辨率对探测到的涡旋总数和半径起着至关重要的作用;（2）视宁效应引入的噪声会降低涡旋的探测率，但对确定涡旋的推断性质没有显著影响。结果表明，逆时针旋转和顺时针旋转的旋流器在分析特性上没有显著差异。约70%的涡旋位于粒间通道。大多数漩涡的寿命不到节奏的两倍，这意味着未来的研究应该旨在使用比6秒更高节奏的数据。在结论中，我们提出了一些有前途的未来研究应用，ASDA可能提供有用的见解。
Swirling motions in the solar atmosphere have been widely observed in recent years and suggested to play a key role in channeling energy from the photosphere into the corona. Here, we present a newly developed Automated Swirl Detection Algorithm (ASDA) and discuss its applications. ASDA is found to be very proficient at detecting swirls in a variety of synthetic data with various levels of noise, implying our subsequent scientific results are astute. Applying ASDA to photospheric observations with a pixel size of 39.2 km sampled by the Solar Optical Telescope on board Hinode suggests a total number of 1.62 × 105 swirls in the photosphere, with an average radius and rotating speed of ∼290 km and <1.0 km s−1, respectively. Comparisons between swirls detected in Bifrost numerical MHD simulations and both ground-based and space-borne observations suggest that (1) the spatial resolution of data plays a vital role in the total number and radii of swirls detected, and (2) noise introduced by seeing effects could decrease the detection rate of swirls, but has no significant influences in determining their inferred properties. All results have shown that there is no significant difference in the analyzed properties between counterclockwise or clockwise rotating swirls. About 70% of swirls are located in intergranular lanes. Most of the swirls have lifetimes of less than twice the cadences, meaning future research should aim to use data with much higher cadences than 6 s. In the conclusions, we propose some promising future research applications where ASDA may provide useful insight.