Other
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981azh....58..969r&link_type=abstract
Astronomicheskii Zhurnal, vol. 58, Sept.-Oct. 1981, p. 969-978. In Russian.
Other
6
Disk Galaxies, Dynamo Theory, Galactic Rotation, Galactic Structure, Interstellar Magnetic Fields, Milky Way Galaxy, Interstellar Gas, Magnetic Dipoles, Magnetic Field Configurations, Quadrupoles, Spiral Galaxies
Scientific paper
A model is developed wherein large-scale magnetic field generation in the Galaxy is determined by two dimensionless dynamo numbers. This relationship is examined using the observed rotation curve of the Galaxy and taking into account the radial variations of the ionized gas layer thickness and of the characteristic velocity of turbulent motions. It is found that the (alpha)(omega) dynamo operates in the main body of the galactic disk, producing an even nonoscillatory azimuthal field and a quadrupole poloidal field. However, in the innermost part of the Galaxy, the alpha-squared dynamo may operate, and both oscillatory and steady fields of both dipole and quadrupole symmetry are possible. The spatial boundaries of the regions of dynamo action are estimated using the analytical solutions of thin-disk dynamo equations obtained in the concentrated helicity approximation. The present model may also be applied to other spiral galaxies, e.g., M31, M81, and NGC 4594.
Ruzmaikin Aleksandr
Shukurov A. M.
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