Activity Complexes and a Prominent Poleward Surge during Solar Cycle 24
Wang,Zi-Fan1,2; Jiang,Jie3,4; Zhang,Jie5; Wang,Jing-Xiu1,2
Source PublicationThe Astrophysical Journal
AbstractAbstract Long-lasting activity complexes (ACs), characterized as a series of closely located, continuously emerging solar active regions (ARs), are considered generating prominent poleward surges from observations. The surges lead to significant variations of the polar field, which are important for the modulation of solar cycles. We aim to study a prominent poleward surge during solar cycle 24 on the southern hemisphere, and analyze its originating ACs and the effect on the polar field evolution. We automatically identify and characterize ARs based on synoptic magnetograms from the Solar Dynamics Observatory. We assimilate these ARs with realistic magnetic configuration into a surface flux transport model, and simulate the creation and migration of the surge. Our simulations well reproduce the characteristics of the surge and show that the prominent surge is mainly caused by the ARs belonging to two ACs during Carrington rotations 2145–2159 (2013 December–2015 January). The surge has a strong influence on the polar field evolution of the southern hemisphere during the latter half of cycle 24. Without the about one-year-long flux emergence in the form of ACs, the polar field around the cycle minimum would have remained at a low level and even reversed to the polarity at cycle 23 minimum. Our study also shows that the long-lived unipolar regions due to the decay of the earlier emerging ARs cause an intrinsic difficulty of automatically identifying and precisely quantifying later emerging ARs in ACs.
KeywordSolar magnetic fields Solar cycle Solar active regions
WOS IDIOP:0004-637X-904-1-abbc1e
PublisherThe American Astronomical Society
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Document Type期刊论文
Corresponding AuthorJiang,Jie
Affiliation1.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, People’s Republic of China
3.School of Space and Environment, Beihang University, Beijing, People’s Republic of China;
4.Key Laboratory of Space Environment Monitoring and Information Processing of MIIT, Beijing, People’s Republic of China
5.Department of Physics and Astronomy, George Mason University, Fairfax, VA 22030, USA
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang,Zi-Fan,Jiang,Jie,Zhang,Jie,et al. Activity Complexes and a Prominent Poleward Surge during Solar Cycle 24[J]. The Astrophysical Journal,2020,904(1).
APA Wang,Zi-Fan,Jiang,Jie,Zhang,Jie,&Wang,Jing-Xiu.(2020).Activity Complexes and a Prominent Poleward Surge during Solar Cycle 24.The Astrophysical Journal,904(1).
MLA Wang,Zi-Fan,et al."Activity Complexes and a Prominent Poleward Surge during Solar Cycle 24".The Astrophysical Journal 904.1(2020).
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