The Nonlinear Turbulent Dynamo

Details The Nonlinear Turbulent Dynamo The Nonlinear Turbulent Dynamo

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.9002m&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #90.02; Bulletin of the American Astronomical Society, Vol. 33, p.919

Astronomy and Astrophysics

Astronomy

Scientific paper

We consider MHD turbulence for situations of interest to the origin of the galactic magnetic field. We simulate the evolution of an initially weak field in nonhelical forced turbulence for a range of Prandtl numbers. The field grows exponentially with the Kulsrud-Anderson k3/2 spectrum until the magnetic energy approaches the viscous-scale kinetic energy, where the magnetic forces then backreact on the velocity. Further growth proceeds more slowly until a saturated state is reached where the magnetic and kinetic energies are equal and where the magnetic energy exists primarily at the resistive scale. We will discuss the structure of this turbulence and the extrapolation of the results to infinite Prandtl number.

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