CURRENT HELICITY OF ACTIVE REGIONS AS A TRACER OF LARGE-SCALE SOLAR MAGNETIC HELICITY
文献类型：期刊论文
| 作者 | Zhang, H.1; Moss, D.2; Kleeorin, N.3,4; Kuzanyan, K.5; Rogachevskii, I.3,4; Sokoloff, D.6; Gao, Y.1 ; Xu, H.1
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2012-05-20 |
| 卷号 | 751期号:1 |
| 关键词 | magnetohydrodynamics (MHD) Sun: activity Sun: dynamo Sun: interior Sun: magnetic topology sunspots |
| 英文摘要 | We demonstrate that the current helicity observed in solar active regions traces the magnetic helicity of the large-scale dynamo generated field. We use an advanced two-dimensional mean-field dynamo model with dynamo saturation based on the evolution of the magnetic helicity and algebraic quenching. For comparison, we also studied a more basic two-dimensional mean-field dynamo model with simple algebraic alpha-quenching only. Using these numerical models we obtained butterfly diagrams both for the small-scale current helicity and also for the large-scale magnetic helicity, and compared them with the butterfly diagram for the current helicity in active regions obtained from observations. This comparison shows that the current helicity of active regions, as estimated by - A . B evaluated at the depth from which the active region arises, resembles the observational data much better than the small-scale current helicity calculated directly from the helicity evolution equation. Here B and A are, respectively, the dynamo generated mean magnetic field and its vector potential. A theoretical interpretation of these results is given. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000303814600047 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6216]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Manchester, Sch Math, Manchester M13 9PL, Lancs, England 3.Ben Gurion Univ Negev, Dept Mech Engn, IL-84105 Beer Sheva, Israel 4.AlbaNova Univ Ctr, NORDITA, SE-10691 Stockholm, Sweden 5.IZMIRAN, Troitsk 142190, Moscow Region, Russia 6.Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119992, Russia |
| 推荐引用方式 GB/T 7714 | Zhang, H.,Moss, D.,Kleeorin, N.,et al. CURRENT HELICITY OF ACTIVE REGIONS AS A TRACER OF LARGE-SCALE SOLAR MAGNETIC HELICITY[J]. ASTROPHYSICAL JOURNAL,2012,751(1). |
| APA | Zhang, H..,Moss, D..,Kleeorin, N..,Kuzanyan, K..,Rogachevskii, I..,...&Xu, H..(2012).CURRENT HELICITY OF ACTIVE REGIONS AS A TRACER OF LARGE-SCALE SOLAR MAGNETIC HELICITY.ASTROPHYSICAL JOURNAL,751(1). |
| MLA | Zhang, H.,et al."CURRENT HELICITY OF ACTIVE REGIONS AS A TRACER OF LARGE-SCALE SOLAR MAGNETIC HELICITY".ASTROPHYSICAL JOURNAL 751.1(2012). |
入库方式： OAI收割
来源：国家天文台
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