Letter to the Editor
Helicity balance and steady-state strength of the dynamo generated galactic magnetic field
N. Kleeorin 1,
D. Moss 2,
I. Rogachevskii 1 and
D. Sokoloff 3
Received 5 June 2000 / Accepted 4 August 2000
We demonstrate that the inclusion of the helicity flux in the magnetic helicity balance in the nonlinear stage of galactic dynamo action results in a radical change in the magnetic field dynamics. The equilibrium value of the large-scale magnetic field is then approximately the equipartition level. This is in contrast to the situation without the flux of helicity, when the magnetic helicity is conserved locally, which leads to substantially subequipartition values for the equilibrium large-scale magnetic field.
Key words: galaxies: magnetic fields magnetic fields turbulence
Send offprint requests to: D. Moss
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© European Southern Observatory (ESO) 2000
Online publication: September 5, 2000