Waves, Coriolis force and the dynamo effect

Abstract

Dynamo activity caused by waves in a rotating magneto-plasma is investigated. In astrophysical environments such as accretion disks and at sufficiently small spatial scales, the Hall effect is likely to play an important role. It is shown that a combination of the Coriolis force and Hall effect can produce a finite $\alpha$-effect by generating net helicity in the small scales. The shear/ion-cyclotron normal mode of the Hall plasma is the dominant contributor to the dynamo action for short scale motions.

8 pages, 3 figures, ApJ (in press)

References in corpus (8)

• Dynamo action by differential rotation in a stably stratified stellar interior
• The inverse cascade and nonlinear alpha-effect in simulations of isotropic helical hydromagnetic turbulence
• Linear Analysis of the Hall Effect in Protostellar Disks
• The Balbus-Hawley instability in weakly ionised discs
• The Joint Cascade of Energy and Helicity in Three-Dimensional Turbulence
• The Effect of the Hall Term on the Nonlinear Evolution of the Magnetorotational Instability: I. Local Axisymmetric Simulations
• Non--linear magnetic field decay in neutron stars -- Theory and observations
• Resolution of an ambiguity in dynamo theory and its consequences for back reaction studies

Cited by in corpus (5)

• Energy transfer in Hall-MHD turbulence: cascades, backscatter, and dynamo action
• Direct simulations of helical Hall-MHD turbulence and dynamo action
• Shear-driven instabilities in Hall-MHD plasmas
• On the quadruple Beltrami fields in thermally relativistic electron-positron-ion plasma
• Multiscale structures in three species magnetoplasmas with two positive ions