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The Present Special Solar Cycle 24: Casting a Shadow over Periodicity of the North–South Hemispherical Asymmetry
Li,F. Y.1,2,3,4; Xiang,N. B.1,3,4; Xie,J. L.1,3,4; Xu,J. C.1,3,4
2019-03-12
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume873Issue:2
AbstractAbstract 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.
KeywordSun: activity Sun: general sunspots
DOI10.3847/1538-4357/ab06bf
Language英语
WOS IDIOP:0004-637X-873-2-ab06bf
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/31014
Collection中国科学院国家天文台
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China; fyli@ynao.ac.cn
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
Recommended Citation
GB/T 7714
Li,F. Y.,Xiang,N. B.,Xie,J. L.,等. The Present Special Solar Cycle 24: Casting a Shadow over Periodicity of the North–South Hemispherical Asymmetry[J]. The Astrophysical Journal,2019,873(2).
APA Li,F. Y.,Xiang,N. B.,Xie,J. L.,&Xu,J. C..(2019).The Present Special Solar Cycle 24: Casting a Shadow over Periodicity of the North–South Hemispherical Asymmetry.The Astrophysical Journal,873(2).
MLA Li,F. Y.,et al."The Present Special Solar Cycle 24: Casting a Shadow over Periodicity of the North–South Hemispherical Asymmetry".The Astrophysical Journal 873.2(2019).
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