Mean-field dynamo models reproduce the large-scale magnetic modes of 3D simulations at least qualitatively, but quantitative closure remains incomplete because transport coefficients are hard to measure and non-locality is ignored.
Helicity Balance and Steady-State Strength of the Dynamo Generated Galactic Magnetic Field
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abstract
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.
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Connecting mean-field theory with dynamo simulations
Mean-field dynamo models reproduce the large-scale magnetic modes of 3D simulations at least qualitatively, but quantitative closure remains incomplete because transport coefficients are hard to measure and non-locality is ignored.