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HELICITY CONSERVATION IN NONLINEAR MEAN-FIELD SOLAR DYNAMO
Pipin, V. V.1,2; Sokoloff, D. D.1,3; Zhang, H.1; Kuzanyan, K. M.1,4
2013-05-01
发表期刊ASTROPHYSICAL JOURNAL
卷号768期号:1
摘要It is believed that magnetic helicity conservation is an important constraint on large-scale astrophysical dynamos. In this paper, we study a mean-field solar dynamo model that employs two different formulations of the magnetic helicity conservation. In the first approach, the evolution of the averaged small-scale magnetic helicity is largely determined by the local induction effects due to the large-scale magnetic field, turbulent motions, and the turbulent diffusive loss of helicity. In this case, the dynamo model shows that the typical strength of the large-scale magnetic field generated by the dynamo is much smaller than the equipartition value for the magnetic Reynolds number 10(6). This is the so-called catastrophic quenching (CQ) phenomenon. In the literature, this is considered to be typical for various kinds of solar dynamo models, including the distributed-type and the Babcock-Leighton-type dynamos. The problem can be resolved by the second formulation, which is derived from the integral conservation of the total magnetic helicity. In this case, the dynamo model shows that magnetic helicity propagates with the dynamo wave from the bottom of the convection zone to the surface. This prevents CQ because of the local balance between the large-scale and small-scale magnetic helicities. Thus, the solar dynamo can operate in a wide range of magnetic Reynolds numbers up to 10(6).
关键词Sun: Dynamo Sun: Interior Sun: Magnetic Topology Turbulence
DOI10.1088/0004-637X/768/1/46
收录类别SCI
语种英语
WOS记录号WOS:000317960500046
引用统计
被引频次:11[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/114a11/8892
专题光学天文研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
2.Russian Acad Sci, Inst Solar Terr Phys, Irkutsk 664033, Russia
3.Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119992, Russia
4.Russian Acad Sci, IZMIRAN, Moscow 142190, Russia
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Pipin, V. V.,Sokoloff, D. D.,Zhang, H.,et al. HELICITY CONSERVATION IN NONLINEAR MEAN-FIELD SOLAR DYNAMO[J]. ASTROPHYSICAL JOURNAL,2013,768(1).
APA Pipin, V. V.,Sokoloff, D. D.,Zhang, H.,&Kuzanyan, K. M..(2013).HELICITY CONSERVATION IN NONLINEAR MEAN-FIELD SOLAR DYNAMO.ASTROPHYSICAL JOURNAL,768(1).
MLA Pipin, V. V.,et al."HELICITY CONSERVATION IN NONLINEAR MEAN-FIELD SOLAR DYNAMO".ASTROPHYSICAL JOURNAL 768.1(2013).
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