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A new dynamo pattern revealed by solar helical magnetic fields
Zhang, Hongqi1; Sakurai, T.2; Pevtsov, A.3; Gao, Yu1; Xu, Haiqing1; Sokoloff, D. D.1,4; Kuzanyan, K.1,5
2010-02-11
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume402Issue:1Pages:L30-L33
AbstractA previously unobservable mirror asymmetry of the solar magnetic field - a key ingredient of the dynamo mechanism which is believed to drive the 11-year activity cycle - has recently been measured. This was achieved through systematic monitoring of solar active regions carried out for more than 20 years at observatories in Mees, Huairou and Mitaka. In this Letter we report on detailed analysis of vector magnetic field data, obtained at Huairou Solar Observing Station in China. Electric current helicity (the product of current and magnetic field components in the same direction) was estimated from the data and a latitude-time plot of solar helicity during the last two solar cycles has been produced. We find that like sunspots helicity patterns propagate equatorwards, but unlike sunspot polarity helicity in each solar hemisphere does not change sign from cycle to cycle, thus confirming the theory. There are, however, two significant time-latitudinal domains in each cycle when the sign briefly inverts. Our findings shed new light on stellar and planetary dynamos and are yet to be included in the theory.
KeywordSun: Activity Sun: Magnetic Fields
DOI10.1111/j.1745-3933.2009.00793.x
Indexed BySCI
Language英语
WOS IDWOS:000274453500065
Citation statistics
Cited Times:52[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7745
Collection太阳物理研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Natl Astron Observ Japan, Tokyo, Japan
3.Natl Solar Observ, Sunspot, NM 88349 USA
4.Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119992, Russia
5.IZMIRAN, Troitsk 142190, Moscow Region, Russia
Recommended Citation
GB/T 7714
Zhang, Hongqi,Sakurai, T.,Pevtsov, A.,et al. A new dynamo pattern revealed by solar helical magnetic fields[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,402(1):L30-L33.
APA Zhang, Hongqi.,Sakurai, T..,Pevtsov, A..,Gao, Yu.,Xu, Haiqing.,...&Kuzanyan, K..(2010).A new dynamo pattern revealed by solar helical magnetic fields.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,402(1),L30-L33.
MLA Zhang, Hongqi,et al."A new dynamo pattern revealed by solar helical magnetic fields".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 402.1(2010):L30-L33.
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