Can a disc dynamo generate large-scale magnetic fields?

Details Can a disc dynamo generate large-scale magnetic fields? Can a disc dynamo generate large-scale magnetic fields?

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281..219t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 1, pp. 219-225.

Astronomy and Astrophysics

Astronomy

69

Accretion, Accretion Discs, Magnetic Fields

Scientific paper

A dynamo process of some kind is widely believed to be able to operate in accretion discs and simple physical considerations suggest that fields generated in this way would have a canonical length-scale of the order of the disc thickness, H. However, in order to drive a hydromagnetic wind from a radius, R, it seems likely that the disc must be threaded by poloidal magnetic fields with length-scales of order R or greater. We investigate how an inverse cascade process, involving reconnection of magnetic loops above and below the disc, might, in principle, lead to large-scale fields being generated by the dynamo.

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