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Strong nonlocality variations in a spherical mean-field dynamo

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dc.contributor.author Brandenburg, Axel
dc.contributor.author Chatterjee, Piyali
dc.date.accessioned 2020-11-10T13:33:53Z
dc.date.available 2020-11-10T13:33:53Z
dc.date.issued 2018-02
dc.identifier.citation Astronomische Nachrichten, Vol. 339, No. 2-3, pp. 118-126 en_US
dc.identifier.issn 1521-3994
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6775
dc.description Restricted Access © WILEY-VCH Verlag Berlin GmbH & Co https://doi.org/10.1002/asna.201813472 en_US
dc.description.abstract To explain the large-scale magnetic field of the sun and other bodies, the mean-field dynamo theory is commonly applied, where one solves the averaged equations for the mean magnetic field. However, the standard approach breaks down when the scale of the turbulent eddies becomes comparable to the scale of the variations of the mean magnetic field. Models showing sharp magnetic field structures have therefore been regarded as unreliable. Our aim is to look for new effects that occur when we relax the restrictions of the standard approach, which becomes particularly important at the bottom of the convection zone where the size of the turbulent eddies is comparable to the depth of the convection zone itself. We approximate the underlying integro-differential equation using a partial differential equation corresponding to a reaction–diffusion-type equation for the mean electromotive force, making an approach that is nonlocal in space and time feasible under conditions where spherical geometry and nonlinearity are included. In agreement with earlier findings, spatiotemporal nonlocality lowers the excitation conditions of the dynamo. Sharp structures are now found to be absent. However, in the surface layers, the field remains similar to before. en_US
dc.language.iso en en_US
dc.publisher WILEY-VCH Verlag GmbH & Co. en_US
dc.subject Magnetic fields en_US
dc.subject Magnetohydrodynamics (MHD) en_US
dc.subject Stars: activity en_US
dc.subject Sun: activity en_US
dc.title Strong nonlocality variations in a spherical mean-field dynamo en_US
dc.type Article en_US


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