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Title:
Fast dynamos, cosmic rays, and the Galactic magnetic field
Authors:
Parker, E. N.
Affiliation:
AA(Chicago Univ., IL)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 1, p. 137-145. (ApJ Homepage)
Publication Date:
12/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cosmic Rays, Cosmology, Dynamo Theory, Interstellar Magnetic Fields, Dissipation, Galactic Halos, Magnetic Field Configurations, Magnetohydrodynamic Turbulence, Turbulent Mixing
DOI:
10.1086/172046
Bibliographic Code:
1992ApJ...401..137P

Abstract

It is suggested here that the dynamo believed to be responsible for the magnetic field of the Galaxy is a fast dynamo due to the dynamical reconnection of the azimuthal field of the Galaxy as the field is deformed by the instability of the gaseous disk and the rapid inflation of magnetic lobes by the cosmic-ray gas to form the Galactic halo. The reconnection of adjacent lobes carries out both the alpha effect and field dissipation essential for the existence of the Galactic alpha-omega dynamo. The azimuthal field is generated primarily in the gaseous disk, while the alpha effect is carried out in the halo.

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