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Chinese Sunspot Drawings and Their Digitization-(VII) Sunspot Penumbra to Umbra Area Ratio Using the Hand-Drawing Records from Yunnan Observatories

文献类型：期刊论文

作者Hou, Jia-Wei1,2; Zeng, Shu-Guang1,2; Zheng, Sheng1,2; Luo, Xiao-Yu1,2; Deng, Lin-Hua3; Li, Yang-Yang1,2; Chen, Yan-Qing1,2; Lin, Gang-Hua4; Feng, Yong-Li3; Tao, Jin-Ping3
刊名RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期2022-09-01
卷号22期号:9页码:8
关键词(Sun:) sunspots Sun: photosphere Sun: activity techniques: image processing
ISSN号1674-4527
DOI10.1088/1674-4527/ac7f87
英文摘要The ratio of penumbral to umbra area of sunspots plays a crucial role in the solar physics fields, especially for understanding the origin and evolution of the solar activity cycle. By analyzing the recently digitized sunspot drawings observed from Yunnan Observatories (1957-2021), we investigate the long-term variation of the penumbral to umbra area ratio of sunspots. An automatic extraction method, based on the maximum between-class variance and the morphological discrimination, is used to accurately extract penumbra and umbra and to calculate the ratio over six solar cycles (cycle 19-24). The expected value of the ratio of penumbra to umbra area is found to be 6.63 +/- 0.98, and it does not exhibit any systematic variation with sunspot latitudes and phases. The average ratio fluctuates from 5 to 7.5 per year and the overall trend has decreased after 1999 compared to the previous one. The ratio of sunspot penumbra to umbra area satisfies the log-normal distribution, implying that its variation is related to the evolution of the photospheric magnetic field. Our results are consistent with previous works.
WOS关键词CURIOUS HISTORY
资助项目Chinese Academy of Sciences ; National Natural Science Foundation of China[U2031202] ; National Natural Science Foundation of China[U1731124] ; 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]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000840966600001
出版者NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
资助机构Chinese Academy of Sciences ; Chinese Academy of Sciences ; 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 ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; 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 ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; 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 ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; 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
源URL[http://ir.bao.ac.cn/handle/114a11/87671]  
专题中国科学院国家天文台
通讯作者Zeng, Shu-Guang
作者单位1.China Three Gorges Univ, Ctr Astron & Space Sci, Yichang 443002, Peoples R China
2.China Three Gorges Univ, Coll Sci, Yichang 443002, Peoples R China
3.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
推荐引用方式
GB/T 7714		 Hou, Jia-Wei,Zeng, Shu-Guang,Zheng, Sheng,et al. Chinese Sunspot Drawings and Their Digitization-(VII) Sunspot Penumbra to Umbra Area Ratio Using the Hand-Drawing Records from Yunnan Observatories[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2022,22(9):8.
APA Hou, Jia-Wei.,Zeng, Shu-Guang.,Zheng, Sheng.,Luo, Xiao-Yu.,Deng, Lin-Hua.,...&Tao, Jin-Ping.(2022).Chinese Sunspot Drawings and Their Digitization-(VII) Sunspot Penumbra to Umbra Area Ratio Using the Hand-Drawing Records from Yunnan Observatories.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,22(9),8.
MLA Hou, Jia-Wei,et al."Chinese Sunspot Drawings and Their Digitization-(VII) Sunspot Penumbra to Umbra Area Ratio Using the Hand-Drawing Records from Yunnan Observatories".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 22.9(2022):8.

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