Shear-current effect in a turbulent convection with a large-scale shear

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dc.creatorRogachevskii, I.
dc.creatorKleeorin, N.
dc.date2007-02-24
dc.date.accessioned2026-07-07T10:21:51Z
dc.date.available2026-07-07T10:21:51Z
dc.descriptionThe shear-current effect in a nonrotating homogeneous turbulent convection with a large-scale constant shear is studied. The large-scale velocity shear causes anisotropy of turbulent convection, which produces the mean electromotive force $\bec{\cal E}^{(W)} \propto {\bf W} {\bf \times} {\bf J}$ and the mean electric current along the original mean magnetic field, where ${\bf W}$ is the background mean vorticity due to the shear and ${\bf J}$ is the mean electric current. This results in a large-scale dynamo even in a nonrotating and nonhelical homogeneous sheared turbulent convection, whereby the $α$ effect vanishes. It is found that turbulent convection promotes the shear-current dynamo instability, i.e., the heat flux causes positive contribution to the shear-current effect. However, there is no dynamo action due to the shear-current effect for small hydrodynamic and magnetic Reynolds numbers even in a turbulent convection, if the spatial scaling for the turbulent correlation time is $τ(k) \propto k^{-2}$, where $k$ is the small-scale wave number.
dc.description8 pages, Physical Review E, in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0702659
dc.identifierhttp://arxiv.org/abs/astro-ph/0702659
dc.identifierPhys.Rev.E75:046305,2007
dc.identifierdoi:10.1103/PhysRevE.75.046305
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/175314
dc.subjectAstrophysics
dc.titleShear-current effect in a turbulent convection with a large-scale shear
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