Scaling law for galactic magnetic fields

N. Kleeorin

doi:10.1023/A:1023333510153

Scaling law for galactic magnetic fields

N. Kleeorin

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

A nonlinear mean field dynamo in turbulent disks and spherical shells is discussed. We use a nonlinearity in the dynamo which includes the effect of delayed back-reaction of the mean magnetic field on the magnetic part of the α- effect. This effect is determined by an evolutionary equation. The axisymmetric case is considered. An analytical expression (in a single-mode approximation) is derived which gives the magnitude of the mean magnetic field as a function of rotation and the parameters for turbulent disks. The value obtained for the mean magnetic field is in agreement with observations for galaxies.

Original language	English
Pages (from-to)	419-423
Number of pages	5
Journal	Studia Geophysica et Geodaetica
Volume	42
Issue number	3
DOIs	https://doi.org/10.1023/A:1023333510153
State	Published - 1 Jan 1998

Keywords

Galactic magnetic fields
Nonlinear mean-field dynamo

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology

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10.1023/A:1023333510153

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abstract = "A nonlinear mean field dynamo in turbulent disks and spherical shells is discussed. We use a nonlinearity in the dynamo which includes the effect of delayed back-reaction of the mean magnetic field on the magnetic part of the α- effect. This effect is determined by an evolutionary equation. The axisymmetric case is considered. An analytical expression (in a single-mode approximation) is derived which gives the magnitude of the mean magnetic field as a function of rotation and the parameters for turbulent disks. The value obtained for the mean magnetic field is in agreement with observations for galaxies.",

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AB - A nonlinear mean field dynamo in turbulent disks and spherical shells is discussed. We use a nonlinearity in the dynamo which includes the effect of delayed back-reaction of the mean magnetic field on the magnetic part of the α- effect. This effect is determined by an evolutionary equation. The axisymmetric case is considered. An analytical expression (in a single-mode approximation) is derived which gives the magnitude of the mean magnetic field as a function of rotation and the parameters for turbulent disks. The value obtained for the mean magnetic field is in agreement with observations for galaxies.

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KW - Nonlinear mean-field dynamo

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ER -

Scaling law for galactic magnetic fields

Abstract

Keywords

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