Physics – Plasma Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phflb...3.2374v&link_type=abstract
(APS Division of Plasma Physics, Annual Meeting, 32nd, Cincinnati, OH, Nov. 12-16, 1990, Invited and Review Papers. A91-46583 19
Physics
Plasma Physics
Accretion Disks, Angular Momentum, Dynamo Theory, Magnetohydrodynamic Waves, Momentum Transfer, Magnetic Field Configurations, Magnetohydrodynamic Stability, Plasma Turbulence, Radiation Pressure
Scientific paper
Recent work regarding the wave field is reviewed to examine the linear and nonlinear behavior of low-frequency waves, emphasizing the notion of the growth of a global magnetic field. Low-frequency, slightly nonaxisymmetric waves are considered to determine whether they can drive an alpha-omega dynamo in a disk of a particular thickness, radius, and Keplerian rotational frequency. A large-scale magnetic field driven by an alpha-omega dynamo results from the nonzero helicity caused by the asymmetry in the wave distribution. A basic model is presented which describes the nonlinear transfer of power to small-scale turbulence, based on the notion that the magnetic field saturates when its pressure is similar to the thermal pressure. The model allows the characterization of the fields produced by the dynamo process as well as the nature of the viscous and thermal instabilities in radiation pressure.
Diamond Patrick H.
Jin Liping
Vishniac Ethan T.
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