Nonlinear dynamo in a simplified statistical model

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A fully self-consistent nonlinear dynamo is studied in the limit of the low kinetic Reynolds number by adopting a simplified statistical model. Governing equations for the evolution of a mean magnetic field and correlation functions of fluctuating magnetic fields are derived for arbitrary values of the magnetic Reynolds number. Within this model, the alpha-effect is shown to be modified by the back reaction of the Lorentz force whilst the turbulent diffusivity remains the same as in the kinematic case. We also show that the nonlinear saturation of small-scale fields can come about via the suppression of the stretching property of the flow.

Original languageEnglish
Pages (from-to)232-239
Number of pages8
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Volume259
Issue number3-4
DOIs
Publication statusPublished - 16 Aug 1999
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Nonlinear dynamo in a simplified statistical model'. Together they form a unique fingerprint.

Cite this