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Swing Excitation of Galactic Magnetic Fields Induced by Spiral Density Waves

Published online by Cambridge University Press:  19 July 2016

Masashi Chiba  and
Makoto Tosa
Masashi Chiba
Affiliation:
Astronomical Institute, Tohoku University, Sendai, Japan
Makoto Tosa
Affiliation:
Astronomical Institute, Tohoku University, Sendai, Japan

Abstract

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The generation and maintenance of galactic magnetic fields are considered when the dynamo-acted disk is perturbed by spiral density waves. The periodic change of gaseous density and shear is coupled with the field oscillation as a dynamo wave. We find the conditions for parametric resonance which increases the efficiency of dynamos. Special attention is paid to two-armed spiral galaxies, in which the BSS field structure is possibly the most effectively excited configuration owing to the present mechanism.

Type
4. Magnetohydrodynamics of Galactic Magnetic Fields
Information
Symposium - International Astronomical Union , Volume 140: Galactic and Intergalactic Magnetic Fields , 1990 , pp. 131 - 132
Copyright
Copyright © Kluwer 1990 

References

Binney, J. & Tremaine, S. (1987). Galactic Dynamics , Princeton University Press, Princeton.Google Scholar
Landau, L.D. & Lifshitz, E.M. (1969). Mechanics , 2nd ed., Pergamon Press, Oxford.Google Scholar