Self-consistent mean field electrodynamics of turbulent dynamos

A. V. Gruzinov, P. H. Diamond

    Research output: Contribution to journalArticle

    Abstract

    A turbulent dynamo in a conducting fluid is accompanied by the generation of small-scale magnetic fields, which are much stronger than the mean dynamo-generated magnetic field. These small-scale fields modify the α effect in such a way as to stabilize the dynamo process, α= (α00R·▽xR)/(1+R2), where α0, β0 are the standard kinematic dynamo parameters, and R is proportional to the mean magnetic field B0, R=B0/(4πρV2/Rm)1/2, ρ is the fluid density, V is the characteristic turbulent velocity, and Rm is the magnetic Reynolds number. The derivation of this formula is illustrated using a simple model - the turbulent dynamo for an asymmetrical top.

    Original languageEnglish (US)
    Pages (from-to)1941-1946
    Number of pages6
    JournalPhysics of Plasmas
    Volume2
    Issue number6
    DOIs
    StatePublished - 1995

    ASJC Scopus subject areas

    • Condensed Matter Physics

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