Current helicity pattern of large-scale magnetic field on the photosphere
文献类型：期刊论文
| 作者 | Wang ChuanYu; Zhang Mei ; ZHANG Mei
|
| 刊名 | SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY
 |
| 出版日期 | 2009-11-01 |
| 卷号 | 52期号:11页码:1713-1717 |
| 关键词 | Sun: Activity magnetic fields current helicity |
| 英文摘要 | Following Pevtsov and Latushko, we study the current helicity pattern of the large-scale magnetic field on the photosphere. We use the same technique as theirs to derive the vector magnetic field (B(r), B(theta), B(phi)) from full-disk longitudinal magnetograms based on the assumption that large-scale magnetic fields evolve rather slowly and the variations of the longitudinal magnetic fields within certain time duration are caused by the changing position angles only. Different from their study, we have calculated the current helicity maps directly from the derived vector magnetograms, rather than from obtaining the latitudinal variation of h(c) by ignoring the role of B(theta) component and averaging B(r) and B(phi), over all solar longitudes. This approach significantly strengthens the evidence of the hemispheric rule presented in the reconstructed vector magnetic field. Our study shows that the established hemispheric sign rule, that is, positive helicity sign in the southern hemisphere and negative helicity sign in the northern hemisphere, is applicable everywhere in the global magnetic field, namely, also evident in weak fields outside active regions, and that the obtained sign pattern is independent of the longitudinal magnetograms and the parameters that we have used. |
| 收录类别 | SCI ; ISTP |
| 语种 | 英语 |
| WOS记录号 | WOS:000271718600014 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8129]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang ChuanYu,Zhang Mei,ZHANG Mei. Current helicity pattern of large-scale magnetic field on the photosphere[J]. SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY,2009,52(11):1713-1717. |
| APA | Wang ChuanYu,Zhang Mei,&ZHANG Mei.(2009).Current helicity pattern of large-scale magnetic field on the photosphere.SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY,52(11),1713-1717. |
| MLA | Wang ChuanYu,et al."Current helicity pattern of large-scale magnetic field on the photosphere".SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY 52.11(2009):1713-1717. |
入库方式： OAI收割
来源：国家天文台
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