The Co-alignment of Winged HαData Observed by the New Vacuum Solar Telescope  

作　　者：Yun-Fang Cai Xu Yang Yong-Yuang Xiang Xiao-Li Yan Zhen-Yu Jin Hui Liu Kai-Fan Ji 

机构地区：[1]Yunnan Observatories,Chinese Academy of Sciences,Kunming 650011,China [2]Big Bear Solar Observatory,New Jersey Institute of Technology,40386 North Shore Lane,Big Bear City,CA,92314,USA

出　　处：《Research in Astronomy and Astrophysics》2022年第6期101-108,共8页天文和天体物理学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China。

摘　　要：The New Vacuum Solar Telescope(NVST)has been releasing its novel winged Hαdata(WHD)since 2021 April,namely the Hαimaging spectroscopic data.Compared with the prior released version,the new data are further coaligned among the off-band images and packaged into a standard solar physics community format.In this study,we illustrate the alignment algorithm used by the novel WHD,which is mainly based on the optical flow method to obtain the translation offset between the winged images.To quantitatively evaluate the alignment results of two images with different similarities,we calculate the alignment accuracies between the images of different off-band and line center,respectively.The result shows that our alignment algorithm could reach up to the accuracy of about 0.″1 when the off-band of winged image is lower than 0.6?.In addition,we introduce the final product of the WHD in detail,which can provide convenience for the solar physicists to use high-resolution Hαimaging spectroscopic data of NVST.

关 键 词：Sun:atmosphere methods:data analysis-techniques:imaging spectroscopy-techniques image processing 

分 类 号：P111[天文地球—天文学]