Automatic detection of small-scale EUV brightenings observed by the Solar Orbiter/EUI
Automatic detection of small-scale EUV brightenings observed by the Solar Orbiter/EUI
复制标题
自动检测太阳轨道飞行器/EUI 观测到的小范围 EUV 增亮
DOI：
10.1051/0004-6361/202243257
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发表时间：
2022
影响因子：
6.5
通讯作者：
Alipour N
中科院分区：
文献类型：
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作者：
Alipour N
准确探测频繁的小尺度极紫外（EUV）增亮对研究日冕加热的物理过程至关重要。目的我们探测到小尺度增亮，称为营火，利用日冕EUV成像观测中观测到的它们的形态和强度结构进行统计分析。方法我们应用了一种基于Zernike矩和支持向量机的方法。利用太阳轨道器/极紫外成像仪（EUI）和太阳动力学天文台（SDO）/大气成像仪（AIA）对营火进行自动识别和跟踪（长度尺度在400公里和4000公里之间），来自50个高分辨率EUV望远镜（HRIEUV）174个连续图像。从21个近同时的AIA图像覆盖相同的视野EUI，我们发现1131篝火，其中58%也被检测到HRIEUV图像。相比之下，大约16%的HRIEUV识别的营火被AIA检测到。我们得到营火的出生率为2 × 10 − 16 m − 2 s − 1。 大约40%的营火持续时间超过5秒，至少在两张HRIEUV图像中观察到。我们发现，27%的营火被发现在日冕亮点，其余73%发生在日冕亮点。我们检测到23个EUI营火持续时间大于245秒。我们发现大约80%的营火是在超颗粒边界形成的，并且具有最高总强度的特征产生于网络连接处和EUI/HRILya观测到的强H I莱曼-α发射区。篝火的总强度、峰值强度和投影面积的概率分布函数遵循绝对指数在2和3之间的幂律行为。这种自相似的行为是篝火形成过程中自组织甚至自组织临界性的可能标志。
ContextAccurate detections of frequent small-scale extreme ultraviolet (EUV) brightenings are essential to the investigation of the physical processes heating the corona.AimsWe detected small-scale brightenings, termed campfires, using their morphological and intensity structures as observed in coronal EUV imaging observations for statistical analysis.MethodsWe applied a method based on Zernike moments and a support vector machine (SVM) classifier to automatically identify and track campfires observed by Solar Orbiter/Extreme Ultraviolet Imager (EUI) and Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA).ResultsThis method detected 8678 campfires (with length scales between 400 km and 4000 km) from a sequence of 50 High Resolution EUV telescope (HRIEUV) 174 Å images. From 21 near co-temporal AIA images covering the same field of view as EUI, we found 1131 campfires, 58% of which were also detected in HRIEUVimages. In contrast, about 16% of campfires recognized in HRIEUVwere detected by AIA. We obtain a campfire birthrate of 2 × 10−16m−2s−1. About 40% of campfires show a duration longer than 5 s, having been observed in at least two HRIEUVimages. We find that 27% of campfires were found in coronal bright points and the remaining 73% have occurred out of coronal bright points. We detected 23 EUI campfires with a duration greater than 245 s. We found that about 80% of campfires are formed at supergranular boundaries, and the features with the highest total intensities are generated at network junctions and intense H I Lyman-αemission regions observed by EUI/HRILya. The probability distribution functions for the total intensity, peak intensity, and projected area of campfires follow a power law behavior with absolute indices between 2 and 3. This self-similar behavior is a possible signature of self-organization, or even self-organized criticality, in the campfire formation process.
太阳的磁流体动力学
DOI：
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发表时间：
2015
期刊：
影响因子：
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作者：
J. Quenby
通讯作者：
J. Quenby