2022/01/31 by Yun-Fang Cai, Yunfang Cai, Xu Yang +8 · 17 citations
Earth and Planetary Sciences · Physics and Astronomy · #Computer science #Data center #Geology #Geophysics and Gravity Measurements #Offset (computer science) #Optics #Physics #Remote sensing #Solar and Space Plasma Dynamics #Solar telescope #Stellar, planetary, and galactic studies #Telescope #astro-ph.IM #astro-ph.SR
paper · pdf · open access · doi:10.1088/1674-4527/ac69b9
published in Research in Astronomy and Astrophysics 22(6), 065010 (IOP Publishing) · 11 pages, 5 figures
arxiv created 2022/04/20 · openalex publication_date 2022/04/22 · openalex created_date 2022/04/26 · arxiv updated 2022/06/01 · openalex updated_date 2026/08/05
The New Vacuum Solar Telescope (NVST) has been releasing its novel winged Ha data (WHD) since April 2021, namely the Ha imaging spectroscopic data. Compared with the prior released version, the new data are further co-aligned 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 Ȧ. In addition, we introduce the final product of the WHD in detail, which can provide convenience for the solar physicists to use high-resolution Hα imaging spectroscopic data of NVST.