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North–South Asymmetry of the Rotation of the Solar Magnetic Field
Xie,Jinglan1,2,3,4; Shi,Xiangjun1,3,4; Qu,Zhining3,5
2018-03-09
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume855Issue:2
AbstractAbstract Using the rotation rates of the solar magnetic field during solar cycles 21 to 23 obtained by Chu et al. by analyzing the synoptic magnetic maps produced by the NSO/Kitt Peak and SOHO/MDI during the years 1975 to 2008, the temporal variation of the equatorial rotation rate (A) and the latitude gradient of rotation (B) in the northern and southern hemispheres are studied separately. The results indicate that the rotation is more differential (about 4.3%) in the southern hemisphere in the considered time frame. It is found that the north–south asymmetry of A and the asymmetry of B show increasing trends in the considered time frame, while the north–south asymmetry of the solar activity shows a decreasing trend. There exists a significant negative correlation (at 95% confidence level) between the asymmetry of B and the asymmetry of the solar activity, and this may be due to stronger magnetic activity in a certain hemisphere that may suppress the differential rotation to some extent. The periodicities in the variation of A and B are also studied, and periods of about 5.0 and 10.5 yr (5.5 and 10.4 yr) can be found for the variation of the northern (southern) hemisphere B. Moreover, the north–south asymmetry of A and the asymmetry of B have similar periods of about 2.6–2.7 and 5.2–5.3 yr. Further, cross-correlation analysis indicates that there exists a phase difference (about eight months) between the northern and southern hemisphere B, and this means that the northern hemisphere B generally leads by about eight months.
Keywordmethods: data analysis Sun: magnetic fields Sun: rotation
DOI10.3847/1538-4357/aaae68
Language英语
WOS IDIOP:0004-637X-855-2-aaae68
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/35663
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; xiejinglan@ynao.ac.cn, shixiangjun@ynao.ac.cn
2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
4.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
5.School of Physics and Electronic Engineering, Sichuan University of Science & Engineering, Zigong 643000, People’s Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Xie,Jinglan,Shi,Xiangjun,Qu,Zhining. North–South Asymmetry of the Rotation of the Solar Magnetic Field[J]. The Astrophysical Journal,2018,855(2).
APA Xie,Jinglan,Shi,Xiangjun,&Qu,Zhining.(2018).North–South Asymmetry of the Rotation of the Solar Magnetic Field.The Astrophysical Journal,855(2).
MLA Xie,Jinglan,et al."North–South Asymmetry of the Rotation of the Solar Magnetic Field".The Astrophysical Journal 855.2(2018).
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