Statistical distribution of current helicity in solar active regions over the magnetic cycle
文献类型：期刊论文
| 作者 | Gao, Y.1 ; Sakurai, T.2; Zhang, H.1; Kuzanyan, K. M.1,2,3; Sokoloff, D.1,4
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2013-08-01 |
| 卷号 | 433期号:2页码:1648-1658 |
| 关键词 | Sun: activity Sun: interior Sun: photosphere |
| 英文摘要 | The current helicity in solar active regions derived from vector magnetograph observations for more than 20 years indicates the so-called hemispheric sign rule; the helicity is predominantly negative in the Northern hemisphere and positive in the Southern hemisphere. In this paper, we revisit this property and compare the statistical distribution of current helicity with Gaussian distribution using the method of normal probability paper. The data sample comprises 6630 independent magnetograms obtained at Huairou Solar Observing Station, China, over 1988-2005 which correspond to 983 solar active regions. We found the following. (1) For the most of cases in time-hemisphere domains the distribution of helicity is close to Gaussian. (2) At some domains (some years and hemispheres) we can clearly observe significant departure of the distribution from a single Gaussian, in the form of two- or multicomponent distribution. (3) For the most non-single-Gaussian parts of the data set we see coexistence of two or more components, one of which (often predominant) has a mean value very close to zero, which does not contribute much to the hemispheric sign rule. The other component has relatively large value of helicity that often determines agreement or disagreement with the hemispheric sign rule in accord with the global structure of helicity reported by Zhang et al. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000321462300061 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5929]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China 2.Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan 3.IZMIRAN, Troitsk 142190, Moscow Region, Russia 4.Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119992, Russia |
| 推荐引用方式 GB/T 7714 | Gao, Y.,Sakurai, T.,Zhang, H.,et al. Statistical distribution of current helicity in solar active regions over the magnetic cycle[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,433(2):1648-1658. |
| APA | Gao, Y.,Sakurai, T.,Zhang, H.,Kuzanyan, K. M.,&Sokoloff, D..(2013).Statistical distribution of current helicity in solar active regions over the magnetic cycle.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,433(2),1648-1658. |
| MLA | Gao, Y.,et al."Statistical distribution of current helicity in solar active regions over the magnetic cycle".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 433.2(2013):1648-1658. |
入库方式： OAI收割
来源：国家天文台
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