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TURBULENT CROSS-HELICITY IN THE MEAN-FIELD SOLAR DYNAMO PROBLEM
Pipin, V. V.1,2,3,4; Kuzanyan, K. M.1,5; Zhang, H.1; Kosovichev, A. G.4
2011-12-20
发表期刊ASTROPHYSICAL JOURNAL
卷号743期号:2
摘要We study the dynamical and statistical properties of turbulent cross-helicity (correlation of the aligned fluctuating velocity and magnetic field components). We derive an equation governing generation and evolution of the turbulent cross-helicity and discuss its meaning for the dynamo. Using the symmetry properties of the problem we suggest a general expression for the turbulent cross-helicity. Effects of the density stratification, large-scale magnetic fields, differential rotation, and turbulent convection are taken into account. We investigate the relative contribution of these effects to the cross-helicity evolution for two kinds of dynamo models of the solar cycle: a distributed mean-field model and a flux-transport dynamo model. We show that the contribution from the density stratification follows the evolution of the radial magnetic field, while large-scale electric currents produce a more complicated pattern of the cross-helicity of comparable magnitude. The pattern of the cross-helicity evolution strongly depends on details of the dynamo mechanism. Thus, we anticipate that direct observations of the cross-helicity on the Sun may serve for the diagnostic purpose of the solar dynamo process.
关键词Sun: Dynamo Sun: Interior Sun: Magnetic Topology Turbulence
DOI10.1088/0004-637X/743/2/160
收录类别SCI
语种英语
WOS记录号WOS:000298178400062
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7906
专题光学天文研究部
作者单位1.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 90065 USA
4.Stanford Univ, Hansen Expt Phys Lab, Stanford, CA 94305 USA
5.Russian Acad Sci, Inst Solar Terr Magnetism & Ionosphere & Radiowav, Troitsk 142092, Moscow Region, Russia
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Pipin, V. V.,Kuzanyan, K. M.,Zhang, H.,et al. TURBULENT CROSS-HELICITY IN THE MEAN-FIELD SOLAR DYNAMO PROBLEM[J]. ASTROPHYSICAL JOURNAL,2011,743(2).
APA Pipin, V. V.,Kuzanyan, K. M.,Zhang, H.,&Kosovichev, A. G..(2011).TURBULENT CROSS-HELICITY IN THE MEAN-FIELD SOLAR DYNAMO PROBLEM.ASTROPHYSICAL JOURNAL,743(2).
MLA Pipin, V. V.,et al."TURBULENT CROSS-HELICITY IN THE MEAN-FIELD SOLAR DYNAMO PROBLEM".ASTROPHYSICAL JOURNAL 743.2(2011).
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