Magnetic fluctuations and formation of large-scale inhomogeneous magnetic structures in a turbulent convection

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dc.creatorRogachevskii, I.
dc.creatorKleeorin, N.
dc.date2007-10-26
dc.date.accessioned2026-07-07T11:12:39Z
dc.date.available2026-07-07T11:12:39Z
dc.descriptionMagnetic fluctuations generated by a tangling of the mean magnetic field by velocity fluctuations are studied in a developed turbulent convection with large magnetic Reynolds numbers. We show that the energy of magnetic fluctuations depends on magnetic Reynolds number only when the mean magnetic field is smaller than $B_{eq} / 4 Rm^{1/4}$, where $B_{eq}$ is the equipartition mean magnetic field determined by the turbulent kinetic energy and Rm is magnetic Reynolds number. Generation of magnetic fluctuations in a turbulent convection with a nonzero mean magnetic field results in a decrease of the total turbulent pressure and may cause formation of the large-scale inhomogeneous magnetic structures even in an originally uniform mean magnetic field. This effect is caused by a negative contribution of the turbulent convection to the effective mean Lorentz force. The inhomogeneous large-scale magnetic fields are formed due to the excitation of the large-scale instability. The energy for this instability is supplied by the small-scale turbulent convection. The discussed effects might be useful for understanding the origin of the solar nonuniform magnetic fields, e.g., sunspots.
dc.description16 pages, 8 Figures, Physical Review E, in press
dc.identifierhttps://arxiv.org/abs/0710.5052
dc.identifierhttp://arxiv.org/abs/0710.5052
dc.identifierPhys.Rev.E76:056307,2007
dc.identifierdoi:10.1103/PhysRevE.76.056307
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191451
dc.subjectAstrophysics
dc.titleMagnetic fluctuations and formation of large-scale inhomogeneous magnetic structures in a turbulent convection
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