Large-scale model of the axisymmetric kinematic dynamo

A formulation of a kinematic dynamo is presented, based on a previously derived self-consistent procedure for obtaining large-scale models for complex system of equations. The model has only a small number of parametrized variables: the small-scale magnetic diffusivity, the scale of the large-scale...

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Detalles Bibliográficos
Publicado: 2016
Materias:
Dynamo
Magnetic fields
MHD
Turbulence
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v456_n4_p3715_Sraibman
http://hdl.handle.net/20.500.12110/paper_00358711_v456_n4_p3715_Sraibman
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00358711_v456_n4_p3715_Sraibman
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spelling paper:paper_00358711_v456_n4_p3715_Sraibman2023-06-08T15:01:41Z Large-scale model of the axisymmetric kinematic dynamo Dynamo Magnetic fields MHD Turbulence A formulation of a kinematic dynamo is presented, based on a previously derived self-consistent procedure for obtaining large-scale models for complex system of equations. The model has only a small number of parametrized variables: the small-scale magnetic diffusivity, the scale of the large-scale fields, and a factor in the explicit expression of the αφφ component of the α tensor. Explicit expressions of what corresponds to the other components of the α tensor and of the diffusivity tensor are derived in terms of the large-scale meridional flow and of the differential rotation law, without introducing additional parameters. A very simple simulation of a solar-like dynamo, employing the model without meridional flow shows reasonable magnetic field evolution, with a cycle duration of about 2/3 that of the Sun, shift of the magnetic field from mid-latitudes towards the equator, poleward migration of the radial field at high latitudes, and correct phase relation between radial and azimuthal components. © 2016 The Authors. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v456_n4_p3715_Sraibman http://hdl.handle.net/20.500.12110/paper_00358711_v456_n4_p3715_Sraibman
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Dynamo
Magnetic fields
MHD
Turbulence
spellingShingle Dynamo
Magnetic fields
MHD
Turbulence
Large-scale model of the axisymmetric kinematic dynamo
topic_facet Dynamo
Magnetic fields
MHD
Turbulence
description A formulation of a kinematic dynamo is presented, based on a previously derived self-consistent procedure for obtaining large-scale models for complex system of equations. The model has only a small number of parametrized variables: the small-scale magnetic diffusivity, the scale of the large-scale fields, and a factor in the explicit expression of the αφφ component of the α tensor. Explicit expressions of what corresponds to the other components of the α tensor and of the diffusivity tensor are derived in terms of the large-scale meridional flow and of the differential rotation law, without introducing additional parameters. A very simple simulation of a solar-like dynamo, employing the model without meridional flow shows reasonable magnetic field evolution, with a cycle duration of about 2/3 that of the Sun, shift of the magnetic field from mid-latitudes towards the equator, poleward migration of the radial field at high latitudes, and correct phase relation between radial and azimuthal components. © 2016 The Authors.
title Large-scale model of the axisymmetric kinematic dynamo
title_short Large-scale model of the axisymmetric kinematic dynamo
title_full Large-scale model of the axisymmetric kinematic dynamo
title_fullStr Large-scale model of the axisymmetric kinematic dynamo
title_full_unstemmed Large-scale model of the axisymmetric kinematic dynamo
title_sort large-scale model of the axisymmetric kinematic dynamo
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v456_n4_p3715_Sraibman
http://hdl.handle.net/20.500.12110/paper_00358711_v456_n4_p3715_Sraibman
_version_ 1768546387864059904

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