Structure of magnetic fields generated by galactic dynamos

Makoto Tosa, Masashi Chiba

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We investigated global axisymmetric (m = 0) and nonaxisymmetric (m=1) modes of magnetic fields generated by the galactic dynamo including the α2-dynamo. The α2-dynamo is responsible for the field generation in the central region of galaxies where the shear of galactic rotation is weak (e.g. MS1). The highest growth rate of m= 1 modes is always smaller than that of m=0 modes; thus m= 1 modes of the standard galactic dynamo cannot explain the dominance of the bisymmetric fields in spiral galaxies. Radial extent of each m=1 mode is too narrow to reproduce the observed bisymmetric structure extending over a disk.

Original languageEnglish
Pages (from-to)147-157
Number of pages11
JournalGeophysical and Astrophysical Fluid Dynamics
Issue number1-3
Publication statusPublished - 1990 Jan


  • Dynamos
  • galaxies
  • magnetohydrodynamics


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