Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..381m&link_type=abstract
Astronomy and Astrophysics, v.308, p.381-386
Astronomy and Astrophysics
Astrophysics
19
Mhd, Galaxies: Magnetic Fields, Galaxies: Spiral
Scientific paper
We investigate whether a modulation of the alpha-effect, associated with a density wave in the disc, can promote the generation of bisymmetric magnetic field structure in spiral galaxies. Some calculations where a similar modulation of the non-circular velocity field was imposed are also reported. We adopt a simplified linear galactic dynamo model, applicable to the thin disc limit, but with a full representation of the azimuthal structure, and show that a parametric resonance can occur when the frequency of the imposed spiral wave ω_s_ satisfies 2ω_0_<~ω_s_<~4ω_0_, where ω_0_ is the frequency of the unperturbed bisymmetric dynamo solution. We deduce that parametric resonance may be important in promoting the generation of bisymmetric magnetic field structure in a fraction of `grand design' spiral galaxies.
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