Dynamo Action in Turbulent Accretion Discs around Black Holes - Part Two - the Mean Magnetic Field

Details Dynamo Action in Turbulent Accretion Discs around Black Holes - Part Two - the Mean Magnetic Field Dynamo Action in Turbulent Accretion Discs around Black Holes - Part Two - the Mean Magnetic Field

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..897p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 195, P. 897, 1981

Astronomy and Astrophysics

Astronomy

83

Scientific paper

The presence of strong differential rotation and vertical density gradients in thin accretion discs allows the generation of a large-scale, mean magnetic field by αω dynamo action.
Analytic expressions for the preferred steady-state solutions are found, which when matched on to an exterior vacuum field show that the class of quadrupole modes (Bφ and Br even, and Bz odd functions of z) are most easily excited. The critical dynamo number of this mode is |Q*e,c1/3 = 2.4, corresponding to a turbulent Mach number of Met = 0.19.

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