Vorticity and astrophysical magnetism

Details Vorticity and astrophysical magnetism Vorticity and astrophysical magnetism

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..87..407b&link_type=abstract

Astrophysics and Space Science, vol. 87, no. 1-2, Oct. 1982, p. 407-423.

Astronomy and Astrophysics

Astrophysics

2

Interstellar Magnetic Fields, Rotating Plasmas, Solar Magnetic Field, Stellar Magnetic Fields, Viscous Damping, Vorticity, Astrophysics, Galactic Evolution, Galactic Nuclei, Ohmic Dissipation, Stellar Evolution

Scientific paper

Viscous resistance to differential rotation causes a current whose magnetic field is proportional to the vorticity of the medium. The magnetic fields of stars and galaxies could arise in this manner, provided that the time scale for development of the field is reasonable. The latter condition (assuming Ohmic rather than synchrotron dissipation) requires that the scale length for a galactic field be less than 3 x 10 to the 13th cm. It is suggested that there may be continual generation of field within the core of a vortex of this dimension in the galactic nucleus, the field lines then being carried outwards by expanding plasma. The main observational evidence in connection with solar, stellar and galactic magnetic fields is appraised in the context of the above theory.

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