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Current helicity pattern of large-scale magnetic field on the photosphere
Wang ChuanYu; Zhang Mei
2009-11-01
Source PublicationSCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY
Volume52Issue:11Pages:1713-1717
AbstractFollowing 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.
KeywordSun: Activity Magnetic Fields Current Helicity
DOI10.1007/s11433-009-0251-6
Indexed BySCI ; ISTP
Language英语
WOS IDWOS:000271718600014
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8129
Collection太阳物理研究部
AffiliationChinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Wang ChuanYu,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.(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.
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