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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.

Information

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