Physics – Plasma Physics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...137..101b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 1, Aug. 1984, p. 101-107.
Physics
Plasma Physics
Accretion Disks, Interstellar Magnetic Fields, Molecular Interactions, Electric Current, Equations Of Motion, Gas Viscosity, Plasma Physics
Scientific paper
A mechanism of generation of magnetic field by molecular viscosity, originally presented by Browne (1968) is reexamined and its application to accretion discs is made. The difference between the viscous retardations of electrons and ions causes electric current which, in turn, generates magnetic field. Estimates of the intensity of the magnetic field component normal to the disc equatorial plane (i.e. Bz component) are performed for very simplified disc models of two types: (1) with diffusing magnetic field, (2) with magnetic field frozen in the matter (infinite conductivity approximation). In both types of discs, however, the magnetic field strength does not exceed 10-2G. This field can be used as a "seed" field in dynamo action as proposed by Pudritz (1981).
Byrka Ryszard
Jaskolska J.
Majer Pietro
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