Investigation of intergranular bright points from the New Vacuum Solar Telescope

Investigation of intergranular bright points from the New Vacuum Solar Telescope
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新型真空太阳望远镜对晶间亮点的研究

DOI:
10.1088/1674-4527/16/5/078
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发表时间:
2015-12
影响因子:
1.8
通讯作者:
Yang, Yun-Fei
Yang, Yun-Fei
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Feng, Song;Deng, Hui;Wang, Feng;Yang, Yun-Fei

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利用新真空太阳望远镜(NVST)拍摄的六幅高分辨率TiO波段图像序列研究了晶间亮点(igBPs)的性质。我们使用拉普拉斯算子和形态学膨胀算法(LMD)检测igBPs,并使用三维分割算法自动跟踪它们,然后研究igBPs在等效直径、强度对比度、寿命、水平速度、扩散指数、运动范围和运动类型方面的形态学、光度学和动力学特性。统计结果证实了以前的研究的基础上G波段或TiO波段的igBP从其他望远镜。这些结果表明,NVST获得的TiO数据稳定可靠,适用于igBPs的研究。此外,我们的方法是可行的检测和跟踪igBPs与TiO数据从NVST。借助太阳动力学天文台/日震和磁成像仪获得的矢量磁图,发现igBPs的性质受到其嵌入的磁环境的强烈影响。在具有较高磁通量的区域中,igBPs的面积覆盖、尺寸和强度对比度值通常较大。然而,在低磁通量区,igBPs的动力学(包括水平速度、扩散指数、运动范围比和运动类型指数)普遍较大。这表明介质中没有强磁场使得igBP看起来更小更弱,扩散更快,并且沿着沿着更直的路径移动得更快更远。
Six high-resolution TiO-band image sequences from the New Vacuum Solar Telescope (NVST) are used to investigate the properties of intergranular bright points (igBPs). We detect the igBPs using a Laplacian and morphological dilation algorithm (LMD) and automatically track them using a three-dimensional segmentation algorithm, and then investigate the morphologic, photometric and dynamic properties of igBPs in terms of equivalent diameter, intensity contrast, lifetime, horizontal velocity, diffusion index, motion range and motion type. The statistical results confirm previous studies based on G-band or TiO-band igBPs from other telescopes. These results illustrate that TiO data from the NVST are stable and reliable, and are suitable for studying igBPs. In addition, our method is feasible for detecting and tracking igBPs with TiO data from the NVST. With the aid of vector magnetograms obtained from the Solar Dynamics Observatory/Helioseismic and Magnetic Imager, the properties of igBPs are found to be strongly influenced by their embedded magnetic environments. The areal coverage, size and intensity contrast values of igBPs are generally larger in regions with higher magnetic flux. However, the dynamics of igBPs, including the horizontal velocity, diffusion index, ratio of motion range and index of motion type are generally larger in the regions with lower magnetic flux. This suggests that the absence of strong magnetic fields in the medium makes it possible for the igBPs to look smaller and weaker, diffuse faster, and move faster and further along a straighter path.
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