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The Present Special Solar Cycle 24: Casting a Shadow over Periodicity of the North-South Hemispherical Asymmetry
Li FY(李富羽)1,2,3,4; Xiang NB(向南彬)1,3,4; Xie JL(谢婧岚)1,3,4; Xu JC(徐景晨)1,3,4
Source PublicationASTROPHYSICAL JOURNAL
2019-03-10
Volume873Issue:2Pages:6
DOI10.3847/1538-4357/ab06bf
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: activity Sun: general sunspots
Abstract

The N-S asymmetry (the north-south hemispheric asymmetry) of sunspot areas for each of the cycles 7-24 have been investigated, and a trend of a long-term characteristic timescale of about eight cycles is inferred, which is confirmed again by studying the fitted lines of the yearly values of the N-S asymmetry of sunspot numbers and sunspot group numbers at solar cycle 24. Then, a periodic behavior of about 12 solar cycles is found in the cumulative counts of yearly sunspot areas for each of the cycles 7-24. Nevertheless, the cumulative counts of sunspot numbers and sunspot group numbers for cycle 24 have different behaviors. Moreover, the dominant hemispheres for cycles 7-23 show a trend of a long-term characteristic timescale of about 12 cycles. However, we cannot determine the dominant hemisphere of cycle 24, as these three parameters give different results for the dominant hemisphere. Cycle 24 is a particular solar activity cycle, as sunspot areas suggest a long characteristic timescale of about 12-cycle length, while sunspot numbers and sunspot group numbers support an eight-cycle period of the N-S asymmetry.

Funding ProjectNational Natural Science Foundation of China[11573065] ; National Natural Science Foundation of China[11633008] ; National Natural Science Foundation of China[11703085] ; National Natural Science Foundation of China[11603069] ; National Natural Science Foundation of China[11803086]
Funding OrganizationNational Natural Science Foundation of China[11573065, 11633008, 11703085, 11603069, 11803086]
Language英语
Subject Area天文学 ; 太阳与太阳系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000461205000001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/19536
Collection太阳物理研究组
Corresponding AuthorLi FY(李富羽)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
2.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
3.State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
4.Key Laboratory of Solar Activity, National Astronomical Observatories, CAS, Beijing 100012, People's Republic of China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li FY,Xiang NB,Xie JL,et al. The Present Special Solar Cycle 24: Casting a Shadow over Periodicity of the North-South Hemispherical Asymmetry[J]. ASTROPHYSICAL JOURNAL,2019,873(2):6.
APA Li FY,Xiang NB,Xie JL,&Xu JC.(2019).The Present Special Solar Cycle 24: Casting a Shadow over Periodicity of the North-South Hemispherical Asymmetry.ASTROPHYSICAL JOURNAL,873(2),6.
MLA Li FY,et al."The Present Special Solar Cycle 24: Casting a Shadow over Periodicity of the North-South Hemispherical Asymmetry".ASTROPHYSICAL JOURNAL 873.2(2019):6.
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