Scaling law for galactic magnetic fields

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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.

Original languageEnglish
Pages (from-to)419-423
Number of pages5
JournalStudia Geophysica et Geodaetica
Volume42
Issue number3
DOIs
StatePublished - 1 Jan 1998

Keywords

  • Galactic magnetic fields
  • Nonlinear mean-field dynamo

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