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14 papers · 2 filters
Topological constraints on magnetic field relaxation
Simon Candelaresi, Axel Brandenburg
Magnetic field relaxation is determined by both the field's geometry and its topology. For relaxation processes, however, it turns out that its topology is a much more stringent co…
Competition of rotation and stratification in flux concentrations
I. R. Losada, A. Brandenburg, N. Kleeorin +1
In a strongly stratified turbulent layer, a uniform horizontal magnetic field can become unstable to spontaneously form local flux concentrations due to a negative contribution of…
Role of longitudinal activity complexes for solar and stellar dynamos
M. J. Mantere, Petri J. Käpylä, Jaan Pelt
In this paper we first discuss observational evidence of longitudinal concentrations of magnetic activity in the Sun and rapidly rotating late-type stars with outer convective enve…
Flux concentrations in turbulent convection
P. J. Käpylä, A. Brandenburg, N. Kleeorin +2
We present preliminary results from high resolution magneto-convection simulations where we find the formation of flux concentrations from an initially uniform magnetic field. We c…
Solar-like differential rotation and equatorward migration in a convective dynamo with a coronal envelope
Jörn Warnecke, Petri J. Käpylä, Maarit. J. Mantere +1
We present results of convective turbulent dynamo simulations including a coronal layer in a spherical wedge. We find an equatorward migration of the radial and azimuthal fields si…
Coherent structures and the saturation of a nonlinear dynamo
Erico L. Rempel, Abraham C. -L. Chian, Axel Brandenburg +1
Eulerian and Lagrangian tools are used to detect coherent structures in the velocity and magnetic fields of a mean--field dynamo, produced by direct numerical simulations of the th…