SUNSPOTS

作品数：85被引量：85H指数：5
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Heliospheric Effect on Solar Activity Parameters during Maximum Phase of Solar Cycle 24(2012–2015)
《Research in Astronomy and Astrophysics》2024年第12期1-10,共10页P.R.Singh Upendra Kr.Singh Kushwaha A.K.Singh T.K.Pant 
The time series of daily data on solar activity proxies, namely the sunspot number(SSN), sunspot area(SSA), solar radio flux(F10.7), modified coronal index(MCI), solar flare index(FI), and cosmic ray intensity(CRI), w...
关键词：SUN activity-Sun flares-Sun heliosphere-Sun rotation-(Sun) SUNSPOTS 
Sunspot Group Detection and Classification by Dual Stream Convolutional Neural Network Method
《Research in Astronomy and Astrophysics》2024年第9期248-259,共12页Nyasha Mariam Mkwanda Weixin Tian Junlin Li 
The automatic detection and analysis of sunspots play a crucial role in understanding solar dynamics and predicting space weather events.This paper proposes a novel method for sunspot group detection and classificatio...
关键词：Sun:magnetic fields Sun:flares (Sun:)sunspots DSCNN Attention mechanism Edge dimming 
A Comparison of Co-temporal Vector Magnetograms Obtained with HMI/SDO and SP/Hinode
《Research in Astronomy and Astrophysics》2023年第12期175-183,共9页Mei Zhang Haocheng Zhang Chengqing Jiang 
supported by the National Natural Science Foundation of China(NSFC,grant No.11973056);the National Key R&D Program of China(grant No.2021YFA1600500)。
Accurate measurement of magnetic fields is very important for understanding the formation and evolution of solar magnetic fields.Currently,there are two types of solar magnetic field measurement instruments:filter-bas...
关键词：The Sun-Sun magnetic fields-Sun photosphere-(Sun:)sunspots 
Research Progress on Solar Flare Forecast Methods Based on Data-driven Models被引量：2
《Research in Astronomy and Astrophysics》2023年第6期12-27,共16页Ke Han Meng-Yao Yu Jun-Feng Fu Wen-Bin Ling De-quan Zheng Jie Wan Peng E 
the support of the National Key Research and Development Program of China(No.2022YFA1604600);the National Natural Science Foundation of China(NSFC,Grant No.11975086)。
Eruption of solar flares is a complex nonlinear process,and the rays and high-energy particles generated by such an eruption are detrimental to the reliability of space-based or ground-based systems.So far,there are n...
关键词：Sun:activity Sun:flares (Sun:)sunspots Sun:magnetic fields 
Flare Forecast Model Based on DS-SMOTE and SVM with Optimized Regular Term被引量：2
《Research in Astronomy and Astrophysics》2023年第6期38-46,共9页Jie Wan Jun-Feng Fu Ren-Qing Wen Ke Han Meng-Yao Yu Peng E 
the support of the National Key Research and Development Program of China(No.2022YFF0503601);the National Natural Science Foundation of China(No.11975086)。
The research of flare forecast based on the machine learning algorithm is an important content of space science.In order to improve the reliability of the data-driven model and weaken the impact of imbalanced data set...
关键词：Sun:flares Sun:magnetic fields Sun:X-rays GAMMA-RAYS (Sun:)sunspots 
Variation of Small Scale Magnetic Fields Over a Century using Ca-K Images as Proxy
《Research in Astronomy and Astrophysics》2023年第4期172-183,共12页Jagdev Singh Muthu Priyal B.Ravindra Luca Bertello Alexei Pevtsov 
supported by the International Space Science Institute (ISSI),Bern,Switzerland and ISSI-Beijing,China。
A combined uniform and long-time series of Ca-K images from the Kodaikanal Observatory,Mount Wilson Observatory and Mauna Loa Solar Observatory was used to identify and study the Ca-K small-scale features and their so...
关键词：SUN activity-Sun chromosphere-(Sun:)sunspots 
The Decay Process of an α-configuration Sunspot
《Research in Astronomy and Astrophysics》2023年第2期73-81,共9页Yang Peng Zhi-Ke Xue Xiao-Li Yan Aimee ANorton Zhong-Quan Qu Jin-Cheng Wang Zhe Xu Li-Heng Yang Qiao-Ling Li Li-Ping Yang Xia Sun 
supported by the National Natural Science Foundation of China(11973084,11873087,12003066 and 11527804);Yunnan Key Laboratory of Solar Physics and Space Science under number 202205AG070009;Yunnan Science Foundation of China under number:202201AT070194;Youth Innovation Promotion Association,CAS(No.2019061);CAS“Light of West China”Program;Yunnan Science Foundation for Distinguished Young Scholars(No.202001AV070004);Key Research and Development Project of Yunnan Province under number 202003AD150019;Young Elite Scientists Sponsorship Program by YNAST.9。
The decay of sunspot plays a key role in magnetic flux transportation in solar active regions(ARs).To better understand the physical mechanism of the entire decay process of a sunspot,an α-configuration sunspot in AR...
关键词：SUN atmosphere-Sun magnetic fields-(Sun:)sunspots 
Inter-correlation between Sunspot Oscillations and Their Internal Structures
《Research in Astronomy and Astrophysics》2022年第11期97-106,共10页Libo Fu Zizhan Zhu Ding Yuan Jiaoyang Wang Song Feng Sergey Anfinogentov 
supported by the National Natural Science Foundation of China(NSFC,Grant Nos.12173012 and 12111530078);the Shenzhen Technology project(GXWD20201230155427003-20200804151658001);supported by the Joint Funds of the NSFC(U1931107)。
Three-and five-minute oscillations are commonly observed in any sunspot.Because they are modulated by the internal thermal and magnetic structures of a sunspot,they could be used as an effective tool for researching s...
关键词：(Sun:)sunspots Sun:oscillations methods:data analysis 
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》2022年第9期132-139,共8页Jia-Wei Hou Shu-Guang Zeng Sheng Zheng Xiao-Yu Luo Lin-Hua Deng Yang-Yang Li Yan-Qing Chen Gang-Hua Lin Yong-Li Feng Jin-Ping Tao 
supported by the National Natural Science Foundation of China (Grant Nos. U2031202 and U1731124);the special foundation work of the Ministry of Science and Technology of China (Grant No. 2014FY120300);the 13th Five-year Informatization Plan of Chinese Academy of Sciences (Grant No. XXH13505-04)。
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...
关键词：Sun:sunspots Sun:photosphere Sun:activity techniques:image processing 
Solar Flare Forecast Model Based on Resampling and Fusion Method被引量：3
《Research in Astronomy and Astrophysics》2022年第8期238-248,共11页Jie Wan Jun-Feng Fu Dai-Min Tan Ke Han Meng-Yao Yu Peng E 
the National Natural Science Foundation of China(Grant No.11975086)project“3D Magnetic Reconnection Reconnection Area Structure Experimental and Numerical Simulation Research”。
Predicting the activity of solar flares is of great significance for studying its physical mechanism and the impact on human production and life.Problems such as class imbalance,high time-series sensitivity,and over-l...
关键词：(Sun:)sunspots Sun:flares Sun:X-rays GAMMA-RAYS Sun:magnetic fields Sun:corona 
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