Magnetic field bending in accretion discs with dynamos

Details Magnetic field bending in accretion discs with dynamos Magnetic field bending in accretion discs with dynamos

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.300..315c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 300, Issue 1, pp. 315-320.

Astronomy and Astrophysics

Astronomy

8

Accretion, Accretion Discs, Magnetic Fields

Scientific paper

We consider the problem of poloidal magnetic field advection and bending of an initially vertical field owing to radial inflow in thin accretion discs. For a ratio of kinematic viscosity to magnetic diffusivity of order unity, significant bending of an externally applied vertical field cannot occur in a disc with no internal dynamo. However, we show that if poloidal field is generated by a dynamo operating near its critical state, then significant field bending may be possible. Our results are of particular relevance to wind launching from accretion discs.

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