Dynamo action by internal waves in accretion disks

Details Dynamo action by internal waves in accretion disks Dynamo action by internal waves in accretion disks

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..648v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. 648-659.

Astronomy and Astrophysics

Astronomy

40

Accretion Disks, Black Holes (Astronomy), Dynamo Theory, Internal Waves, Stellar Magnetic Fields, Angular Momentum, Low Frequencies, Wave Propagation

Scientific paper

An analysis is conducted of the ability of low frequency, slightly nonaxisymmetric waves in thin accretion disks to drive an alpha-Omega dynamo in a disk. The asymmetry in the wave distribution which creates a nonzero helicity follows from the fact that the fundamental waves all have a positive angular momentum flux. As a result there will be a large-scale magnetic field driven by an alpha-Omega dynamo. It is also likely that small-scale fields, driven by higher-order wave modes, will contribute significantly to the local value of B(r)B(phi). It is argued that the magnetic field saturates when its pressure is comparable to the thermal pressure, and a crude model of the nonlinear of transfer of power to small-scale turbulence is presented.

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