A three-dimensional non-linear model for a galactic dynamo

Details A three-dimensional non-linear model for a galactic dynamo A three-dimensional non-linear model for a galactic dynamo

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.289..554m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 289, Issue 3, pp. 554-558.

Astronomy and Astrophysics

Astronomy

12

Magnetic Fields, Mhd, Galaxies: Individual: M81, Galaxies: Interactions, Galaxies: Magnetic Fields, Galaxies: Spiral

Scientific paper

We describe a new code to solve the non-linear mean field dynamo equation in three spatial dimensions, in a form suited to investigating dynamo action in the discs of spiral galaxies. The code is used to model the generation of non-axisymmetric magnetic fields during the tidal interaction between M81 and its companion galaxy NGC 3077. Additionally, it is shown that, in linear theory, a spiral wave perturbation to the alpha effect can enhance the growth rate of the bisymmetric dynamo wave by parametric resonance. Results are compared with those obtained previously using an essentially two-dimensional approximation.

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