NAOC Open IR
Chinese sunspot drawings and their digitization - (II) accuracy analysis for digitized sunspot hand-drawing records of Yunnan Observatories
Peng, Yang1; Luo, Xiao-Yu1; Zeng, Shu-Guang1; Deng, Lin-Hua2,4; Zheng, Sheng1; Lin, Gang-Hua3; Cheng, Yu-Lin1; Tao, Jin-Ping2; Feng, Yong-Li2
2020-04-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume20Issue:4Pages:7
AbstractSunspots are the most striking and easily observed magnetic structures of the Sun, and statistical analysis of solar historical data could reveal a wealth of information on the long-term variation of solar activity cycle. The hand-drawn sunspot records of Yunnan Observatories, Chinese Academy of Sciences have been accumulating for more than 60 years, and nearly 16 000 images have been preserved. In the future, the observation mode of recording sunspots by hand-drawing will be replaced inevitably by digital images observed either at ground or in space. To connect the hand-drawn sunspot data and the purely digital sunspot data in future, it is necessary to analyze the systematic errors of the data which are observed by the two observation modes in the period of transition. In this paper, we choose 268 round sunspots (H-type in modified Zurich sunspot classification) from the drawing of Yunnan Observatories to compare their positions and areas with the CCD observations made by Helioseismic and Magnetic Imager (HMI) on board Solar Dynamic Observatory (SDO) and Global Oscillation Network Group (GONG). We find that the latitude and longitude accuracy of hand-drawn sunspot are within -0.127 and 2.29 degree respectively, and the area accuracy is about 16.36 sunspot unit (mu Hem). Systematic errors apparently decrease with large sunspot.
Keywordsunspots methods data analysis techniques image processing
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; special foundation work of the Ministry of Science and Technology of China ; special foundation work of the Ministry of Science and Technology of China ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; special foundation work of the Ministry of Science and Technology of China ; special foundation work of the Ministry of Science and Technology of China ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; special foundation work of the Ministry of Science and Technology of China ; special foundation work of the Ministry of Science and Technology of China ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; special foundation work of the Ministry of Science and Technology of China ; special foundation work of the Ministry of Science and Technology of China ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS
DOI10.1088/1674-4527/20/4/61
Language英语
Funding ProjectNational Natural Science Foundation of China[U1731124] ; National Natural Science Foundation of China[U1531247] ; National Natural Science Foundation of China[11427901] ; National Natural Science Foundation of China[11873089] ; special foundation work of the Ministry of Science and Technology of China[2014FY120300] ; 13th Five-year Informatization Plan of Chinese Academy of Sciences[XXH13505-04] ; Youth Innovation Promotion Association CAS
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; special foundation work of the Ministry of Science and Technology of China ; special foundation work of the Ministry of Science and Technology of China ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; special foundation work of the Ministry of Science and Technology of China ; special foundation work of the Ministry of Science and Technology of China ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; special foundation work of the Ministry of Science and Technology of China ; special foundation work of the Ministry of Science and Technology of China ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; special foundation work of the Ministry of Science and Technology of China ; special foundation work of the Ministry of Science and Technology of China ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; 13th Five-year Informatization Plan of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000529933300001
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/55222
Collection中国科学院国家天文台
Corresponding AuthorZeng, Shu-Guang
Affiliation1.China Three Gorges Univ, Coll Sci, Yichang 443002, Peoples R China
2.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
4.Chongqing Univ Arts & Sci, Chongqing 402160, Peoples R China
Recommended Citation
GB/T 7714
Peng, Yang,Luo, Xiao-Yu,Zeng, Shu-Guang,et al. Chinese sunspot drawings and their digitization - (II) accuracy analysis for digitized sunspot hand-drawing records of Yunnan Observatories[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2020,20(4):7.
APA Peng, Yang.,Luo, Xiao-Yu.,Zeng, Shu-Guang.,Deng, Lin-Hua.,Zheng, Sheng.,...&Feng, Yong-Li.(2020).Chinese sunspot drawings and their digitization - (II) accuracy analysis for digitized sunspot hand-drawing records of Yunnan Observatories.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,20(4),7.
MLA Peng, Yang,et al."Chinese sunspot drawings and their digitization - (II) accuracy analysis for digitized sunspot hand-drawing records of Yunnan Observatories".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 20.4(2020):7.
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