Manifestations of bright points observed in G-band and Ca II H by Hinode/SOT
Manifestations of bright points observed in G-band and Ca II H by Hinode/SOT
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DOI：
10.1088/1674-4527/18/10/125
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发表时间：
2018-10
影响因子：
1.8
通讯作者：
Yanxiao Liu;N. Wu;Jun Lin
中科院分区：
文献类型：
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作者：
Yanxiao Liu;N. Wu;Jun Lin
提出了一种识别和跟踪光球层（G波段）和色球层（Ca II H）中磁亮点（简称亮点）的算法，以及将光球层亮点（PBP）与其共轭色球层亮点（CBP）配对的算法。分析了Hinode/SOT在平静太阳盘中心附近观测到的两组数据。大约278个PBP-CBP对被识别和跟踪。PBPs和CBPs的寿命均服从指数分布，平均寿命分别为174 s和163 s。发现两种BPs的出现时间、消失时间和寿命的差异均服从高斯分布，这可能表明PBP和CBP的形成/崩解机制不同。然而，PBPs和CBPs的寿命彼此正相关，相关系数为0.8。此外，还计算了PBP及其共轭CBP之间的水平位移，其平均值和标准差均为（67.7 ± 38.5）km，符合高斯函数。我们还计算了磁流体波沿磁通管沿着传播引起的磁通管形状变化的幅度，发现它很好地服从指数分布。
An algorithm was developed for identifying and tracking a magnetic bright point, or bright point (BP) for short, observed in both the photosphere (G-band) and chromosphere (Ca II H), as well as for pairing a photospheric BP (PBP) with its conjugate chromospheric BP (CBP). Two sets of data observed by Hinode/SOT in the quiet Sun near the disk center were analyzed. About 278 PBP-CBP pairs were identified and tracked. Lifetimes of both the PBPs and CBPs follow an exponential distribution with average lifetimes of 174 s and 163 s, respectively. We found that the differences in appearance time, in disappearance time and in lifetime of the two kinds of BPs all follow Gaussian distributions, which may indicate that the mechanisms of PBP and CBP formation/disintegration are different. However, the lifetimes of PBPs and CBPs are positively correlated with one another, with a correlation coefficient of 0.8. Furthermore, we calculated the horizontal displacement between the PBP and its conjugate CBP, which follows a Gaussian function with an average and standard deviation of (67.7 ± 38.5) km. We also calculated the amplitude of the flux tube shape change which might be caused by MHD waves propagating along the flux tube, and found that it follows an exponential distribution very well.