dynamo action
Kinematic dynamo action in a sphere. I. Effects of differential rotation and meridional circulation on solutions with axial dipole symmetry
... Dynamo action occurs in discrete zones in velocity parameter ...known dynamo action occurs, or at least no magnetic elds are generated that can be represented with the numerical resolution ...
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Direct numerical simulations of helical dynamo action: MHD and beyond
... decades dynamo theory made significant ad- vances, pushed forward by the positive feedback from di- rect numerical simulations (DNS), and the growing power of ...of dynamo action was first studied ...
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Dynamo action in a quasi-Keplerian Taylor-Couette flow
... by dynamo action, in which the motion of electrically conducting fluid stretches and thereby am- plifies some original seed ...of dynamo action then becomes a lin- ear instability problem, ...
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Kinematic dynamo action in a sphere. II. Symmetry selection
... by dynamo action in their electrically conducting ...for dynamo genera- tion of steady elds with axial dipole symmetry by solving the kinematic dynamo ...dynamical dynamo because the ...
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Dynamo action in a quasi-Keplarian Taylor-Couette flow
... by dynamo action, in which the motion of electrically conducting fluid stretches and thereby amplifies some original seed ...of dynamo action then becomes a linear instability problem, with ...
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Kinematic dynamo action in square and hexagonal patterns
... of dynamo theory is to un- derstand the origin of large-scale magnetic fields observed in stars and ...the dynamo action re- quired certainly depends on many parameters, it is of- ten useful to study ...
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Dynamo action in rapidly rotating Rayleigh-Benard convection at infinite Prandtl number
... study dynamo action driven by turbulent Boussinesq convection in a rapidly rotating ...kinematic dynamo problem responsible for the exponential growth of the magnetic field, the latter encodes the ...
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The optimal kinematic dynamo driven by steady flows in a sphere
... kinematic dynamo models in a cube (Willis 2012; Chen et ...sustain dynamo action, Rm must be sufficiently large such that field creation outweighs field destruction through dissipation, and indeed Rm ...
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The Karlsruhe Dynamo Experiment
... homogeneous dynamo has been developed and a test facility was setup at the Forschungszentrum ...permanent dynamo action can be generated in a cylindrical container filled with liquid sodium in which ...
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On the mean-field theory of the Karlsruhe Dynamo Experiment
... The basic idea of this experiment was proposed by Busse (1975, 1978, 1992). It is very similar to an idea discussed before by Gailitis (1967). The essential piece of the experi- mental device, the dynamo module, ...
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Doppler images and the underlying dynamo: the case of AF Leporis
... theoretical dynamo mod- ...magnetic dynamo in such stars is based on the solar case, where the solar activ- ity cycle is believed to be generated through dynamo action op- erating either in ...
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Vortex dynamos
... and eventually becoming negative for k > 2. For large k advection is not sufficient to overcome dissipation. This behaviour is typical of dynamos with velocity fields that vary on O (1) horizontal lengthscales (e.g. ...
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Scale disparities and magnetohydrodynamics in the Earth’s core
... relevant dynamo action, are extremely sensitive to the intricate dynamical balance between the viscous, Coriolis and Lorentz forces; similarly, the structure and strength of the magnetic eld generated by ...
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A Multiscale Dynamo Model Driven by Quasi-geostrophic Convection
... Soward dynamo model (denoted by CSDM), since they were first discussed by Childress & Soward (1972) and the only difference between the two models is the strength of the magnetic ...
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Large-scale-vortex dynamos in planar rotating convection
... large-scale dynamo found close to the onset of convection and a regime in which there is no dynamo action; this boundary was deduced from consideration of the kinematic dynamo growth rates of ...
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The electromotive force in multi-scale flows at high magnetic Reynolds number
... “Small-scale dynamo theory” or “Fluctuation dynamo theory” examines whether and how fluid flows can act so as to sustain magnetic fields on scales smaller than or up to the typical scale of the energy ...
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Effect of metallic walls on dynamos generated by laminar boundary-driven flow in a spherical domain
... to dynamo action ...for dynamo action, contrary to what might have been expected from the results of Spence et ...the dynamo action as the critical magnetic Reynolds decreases by ...
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Growth rate degeneracies in kinematic dynamos
... kinematic dynamo action and its dependence on magnetic boundary conditions, we need to solve the in- duction equation with a prescribed velocity ...driven dynamo problem ...
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A numerical study on magnetic polarity transition in an MHD dynamo model
... numerical dynamo models have demon- strated that polarity reversals can occur spontaneously by the MHD process in the core ...reversing dynamo model was first obtained by Glatzmaier and Roberts (1995), many ...
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Can the Earth's dynamo run on heat alone?
... We now make some simplifying assumptions. The first is to av- erage out the time fluctuations associated with the convection and dynamo process to leave integrals that describe only the slow evo- lution of the ...
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