Dynamo Action in Magnetohydrodynamics and Hall-Magnetohydrodynamics

Details Dynamo Action in Magnetohydrodynamics and Hall-Magnetohydrodynamics Dynamo Action in Magnetohydrodynamics and Hall-Magnetohydrodynamics

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...587..472m&link_type=abstract

The Astrophysical Journal, Volume 587, Issue 1, pp. 472-481.

Astronomy and Astrophysics

Astronomy

30

Galaxies: Magnetic Fields, Ism: Magnetic Fields, Magnetic Fields, Magnetohydrodynamics: Mhd, Stars: Magnetic Fields

Scientific paper

The first direct numerical simulations of turbulent Hall dynamos are presented. The evolution of an initially weak and small-scale magnetic field in a system maintained in a stationary regime of hydrodynamic turbulence (by a stirring force at a macroscopic scale) is studied to explore the conditions for exponential growth of the magnetic energy. The Hall current is shown to have a profound effect on turbulent dynamo action; it can strongly enhance or suppress the generation of the large-scale magnetic energy depending on the relative values of the length scales of the system.

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