The Present Special Solar Cycle 24: Casting a Shadow over Periodicity of the North–South Hemispherical Asymmetry
文献类型：期刊论文
| 作者 | Li,F. Y.1,2,3,4; Xiang,N. B.1,2,4; Xie,J. L.1,2,4; Xu,J. C.1,2,4 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-03-12 |
| 卷号 | 873期号:2 |
| 关键词 | Sun: activity Sun: general sunspots |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab06bf |
| 英文摘要 | 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. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-873-2-AB06BF |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/31013]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Key Laboratory of Solar Activity, National Astronomical Observatories, CAS, Beijing 100012, People's Republic of China 2.State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, People's Republic of China 3.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China; fyli@ynao.ac.cn |
| 推荐引用方式 GB/T 7714 | Li,F. Y.,Xiang,N. B.,Xie,J. L.,et al. 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). |
入库方式： OAI收割
来源：国家天文台
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