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We show that simple 2 and 3-layer flux-transport dynamos, when forced at the top by a poloidal source term, can produce a widely varying amplitude of toroidal field at the bottom, depending on how clo...
Catastrophic quenching in alpha-Omega dynamos revisited
Catastrophic quenching alpha-Omega revisited
2011/9/27
At large magnetic Reynolds numbers, magnetic helicity evolution plays an important role in astrophysical large-scale dynamos. The recognition of this fact led to the development of the dynamical alpha...
Dissipation in dynamos at low and high magnetic Prandtl numbers
low and high magnetic Prandtl numbers Solar and Stellar Astrophysics
2011/1/10
Using simulations of helically driven turbulence, it is shown that the ratio of kinetic to magnetic energy dissipation scales with the magnetic Prandtl number in power law fashion with an exponent of ...
Dynamos in Stellar Convection Zones: of Wreaths and Cycles
Dynamos Stellar Convection Zones Wreaths and Cycles
2010/11/15
We live near a magnetic star whose cycles of activity are driven by dynamo action beneath the surface. In the solar convection zone, rotation couples with plasma motions to build
highly organized mag...
Global-scale wreath-building dynamos in stellar convection zones
convection interiors magnetic fields stars rotation
2010/11/10
When stars like our Sun are young they rotate rapidly and are very magnetically active. We explore dynamo action in rapidly rotating suns with the 3-D MHD anelastic spherical harmonic (ASH) code. The ...
Numerical simulation of dynamos with scale separation
Numerical simulation scale separation magnetic fields
2009/6/4
Explaining the origin of magnetic fields in astrophysical bodies has long beena challenge for theorists. While mean field dynamo theory has been developedfor a while this theory runs into several prob...