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HEMISPHERIC HELICITY TREND FOR SOLAR CYCLE 24
Hao, Juan; Zhang, Mei
2011-06-01
发表期刊ASTROPHYSICAL JOURNAL LETTERS
卷号733期号:2
摘要Using vector magnetograms obtained with the Spectro-polarimeter (SP) on board Hinode satellite, we studied two helicity parameters (local twist and current helicity) of 64 active regions that occurred in the descending phase of solar cycle 23 and the ascending phase of solar cycle 24. Our analysis gives the following results. (1) The 34 active regions of the solar cycle 24 follow the so-called hemispheric helicity rule, whereas the 30 active regions of the solar cycle 23 do not. (2) When combining all 64 active regions as one sample, they follow the hemispheric helicity sign rule as in most other observations. (3) Despite the so-far most accurate measurement of vector magnetic field given by SP/Hinode, the rule is still weak with large scatters. (4) The data show evidence of different helicity signs between strong and weak fields, confirming previous result from a large sample of ground-based observations. (5) With two example sunspots we show that the helicity parameters change sign from the inner umbra to the outer penumbra, where the sign of penumbra agrees with the sign of the active region as a whole. From these results, we speculate that both the Sigma-effect (turbulent convection) and the dynamo have contributed in the generation of helicity, whereas in both cases turbulence in the convection zone has played a significant role.
关键词Magnetic Fields Sun: Activity Sunspots
DOI10.1088/2041-8205/733/2/L27
收录类别SCI
语种英语
WOS记录号WOS:000293135000011
引用统计
被引频次:29[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7834
专题太阳物理研究部
作者单位Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China
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Hao, Juan,Zhang, Mei. HEMISPHERIC HELICITY TREND FOR SOLAR CYCLE 24[J]. ASTROPHYSICAL JOURNAL LETTERS,2011,733(2).
APA Hao, Juan,&Zhang, Mei.(2011).HEMISPHERIC HELICITY TREND FOR SOLAR CYCLE 24.ASTROPHYSICAL JOURNAL LETTERS,733(2).
MLA Hao, Juan,et al."HEMISPHERIC HELICITY TREND FOR SOLAR CYCLE 24".ASTROPHYSICAL JOURNAL LETTERS 733.2(2011).
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