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The origin of the helicity hemispheric sign rule reversals in the mean-field solar-type dynamo
Pipin, V. V.1,2,3; Zhang, H.1; Sokoloff, D. D.1,4; Kuzanyan, K. M.1,5; Gao, Y.1
2013-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume435Issue:3Pages:2581-2588
AbstractObservations of proxies of the magnetic helicity in the Sun over the past two solar cycles revealed reversals of the helicity hemispheric sign rule (negative in the North and positive in the South hemispheres). We apply the mean-field solar dynamo model to study the reversals of the magnetic helicity sign for the dynamo operating in the bulk of the solar convection zone. The evolution of the magnetic helicity is governed by the conservation law. We found that the reversal of the sign of the small-scale magnetic helicity follows the dynamo wave propagating inside the convection zone. Therefore, the spatial patterns of the magnetic helicity reversals reflect the processes which contribute to generation and evolution of the large-scale magnetic fields. At the surface, the patterns of the helicity sign reversals are determined by the magnetic helicity boundary conditions at the top of the convection zone. We demonstrate the impact of fluctuations in the dynamo parameters and variability in dynamo cycle amplitude on the reversals of the magnetic helicity sign rule. The obtained results suggest that the magnetic helicity of the large-scale axisymmetric field can be treated as an additional observational tracer for the solar dynamo and it probably can be used for the solar activity forecast as well.
KeywordDynamo Mhd Turbulence Sun: Activity Sun: Interior Sun: Magnetic Fields
DOI10.1093/mnras/stt1465
Indexed BySCI
Language英语
WOS IDWOS:000325773000059
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8897
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Russian Acad Sci, Inst Solar Terr Phys, Irkutsk 664033, Russia
3.Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 94305 USA
4.Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119992, Russia
5.Russian Acad Sci, IZMIRAN, Troitsk 142190, Moscow Region, Russia
Recommended Citation
GB/T 7714
Pipin, V. V.,Zhang, H.,Sokoloff, D. D.,et al. The origin of the helicity hemispheric sign rule reversals in the mean-field solar-type dynamo[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,435(3):2581-2588.
APA Pipin, V. V.,Zhang, H.,Sokoloff, D. D.,Kuzanyan, K. M.,&Gao, Y..(2013).The origin of the helicity hemispheric sign rule reversals in the mean-field solar-type dynamo.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,435(3),2581-2588.
MLA Pipin, V. V.,et al."The origin of the helicity hemispheric sign rule reversals in the mean-field solar-type dynamo".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 435.3(2013):2581-2588.
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