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An Incoherent Dynamo in Accretion Disks
Ethan T. Vishniac, Axel Brandenburg
We use the mean-field dynamo equations to show that an incoherent alpha effect in mirror-symmetric turbulence in a shearing flow can generate a large scale, coherent magnetic field…
Global Aspects of Elliptical Instability in Tidally Distorted Accretion Disks
Dongsu Ryu, Jeremy Goodman, Ethan T. Vishniac
Tidally distorted accretion disks in binary star systems are subject to a local hydrodynamic instability which excites internal waves. This instability is three dimensional a…
Magnetohydrodynamic Turbulence in Accretion Disks
Ethan T. Vishniac
Recent work on the structure of magnetic fields in a turbulent medium gives predictions for the properties of the magnetic flux tubes as a function of the Mach number and scale of…
The Growth Rate of Tidally Excited Waves in Accretion Disks
Ethan T. Vishniac, Changsong Zhang
Accretion disks in close binary systems are subject to a tidally driven parametric instability which leads to the growth of internal waves near the outer edges of such disks (Goodm…