Helicity observations of active regions during the exchange period of Solar Cycle 24 and 25
文献类型：期刊论文
| 作者 | Liu, Jihong1,2; Liu, Yu1,2,3,4,5; Zhang, Yin3; Huang, Jin1; Zhang, HongQi3 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2021-12-18 |
| 卷号 | 509期号:4页码:5298-5304 |
| ISSN号 | 0035-8711 |
| 关键词 | Sun: photosphere sunspots Sun: magnetic fields |
| DOI | 10.1093/mnras/stab3182 |
| 英文摘要 | Using vector magnetic field data from the Helioseismic and Magnetic Imager instrument onboard the Solar Dynamics Observatory, we study the signs of helicity (magnetic twist alpha(av), z-component of current helicity H-c) and tilt angle of 85 sample active regions (ARs) that appeared on the central solar disc (within +/- 45 degrees from disc centre) between December 2018 and November 2020. This time range spans the exchange period of Solar Cycle 24 and 25. The main findings are as follows: (1) As a whole, 62 per cent of sample ARs follow the helicity hemispherical sign rule, and our observational results do not show any hemispherical rule sign reversal at the end or beginning of a Solar Cycle. (2) Interestingly, there is no significant statistical relationship between helicity and tilt angle, as in contrast with the general idea on the conservation of magnetic helicity in the solar convection zone inferred by the relationship between the photospheric helicity and tilt angle. It is also found that the hemispherical tendency of helicity and tilt angle is more obvious for ARs at high latitudes, and the hemispherical preference is more obvious for ARs with magnetic twist and writhe of the opposite signs than for ARs with the same signs. |
| WOS关键词 | MAGNETIC HELICITY ; FIELD ; SUN ; TWIST ; TILT ; RULE ; FLUX |
| 资助项目 | Strategic Priority Research Program of CAS[XDA-17040507] ; National Science Foundation of China[NSFC 11533009] ; National Science Foundation of China[11973086] ; National Science Foundation of China[11903016] ; National Science Foundation of China[12073040] ; National Science Foundation of China[12073041] ; Natural Science Foundation of Hebei Province[A2019110051] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000833030300001 |
| 资助机构 | Strategic Priority Research Program of CAS ; Strategic Priority Research Program of CAS ; National Science Foundation of China ; National Science Foundation of China ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Strategic Priority Research Program of CAS ; Strategic Priority Research Program of CAS ; National Science Foundation of China ; National Science Foundation of China ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Strategic Priority Research Program of CAS ; Strategic Priority Research Program of CAS ; National Science Foundation of China ; National Science Foundation of China ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province ; Strategic Priority Research Program of CAS ; Strategic Priority Research Program of CAS ; National Science Foundation of China ; National Science Foundation of China ; Natural Science Foundation of Hebei Province ; Natural Science Foundation of Hebei Province |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/87860]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Liu, Jihong; Liu, Yu |
| 作者单位 | 1.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China 2.Shijiazhuang Univ, Coll Mech & Elect Engn, Coll Phys, Shijiazhuang 050035, Hebei, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China 4.Yunnan Normal Univ, Sch Phys & Elect Informat, Kunming 650500, Yunnan, Peoples R China 5.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Jihong,Liu, Yu,Zhang, Yin,et al. Helicity observations of active regions during the exchange period of Solar Cycle 24 and 25[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,509(4):5298-5304. |
| APA | Liu, Jihong,Liu, Yu,Zhang, Yin,Huang, Jin,&Zhang, HongQi.(2021).Helicity observations of active regions during the exchange period of Solar Cycle 24 and 25.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,509(4),5298-5304. |
| MLA | Liu, Jihong,et al."Helicity observations of active regions during the exchange period of Solar Cycle 24 and 25".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 509.4(2021):5298-5304. |
入库方式： OAI收割
来源：国家天文台
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