492 citations
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10 papers · 1 filter
The problem of small and large scale fields in the solar dynamo
A. Brandenburg, N. E. L. Haugen, P. J. Käpylä +1
Three closely related stumbling blocks of solar mean field dynamo theory are discussed: how dominant are the small scale fields, how is the alpha effect quenched, and whether magne…
Estimates of the Strouhal number from numerical models of convection
P. J. Käpylä, M. J. Korpi, M. Ossendrijver +1
We determine the Strouhal number (hereafter St), which is essentially a nondimensional measure of the correlation time, from numerical calculations of convection. We use two indepe…
Magnetic field generation in fully convective rotating spheres
W. Dobler, M. Stix, A. Brandenburg
Magnetohydrodynamic simulations of fully convective, rotating spheres with volume heating near the center and cooling at the surface are presented. The dynamo-generated magnetic fi…
Local models of stellar convection III: The Strouhal number
P. J. Käpylä, M. J. Korpi, M. Ossendrijver +1
Aims: The Strouhal number (St), which is a nondimensional measure of the correlation time, is determined from numerical models of convection. The Strouhal number arises in the mean…
Local models of stellar convection II: Rotation dependence of the mixing length relations
P. J. Käpylä, M. J. Korpi, M. Stix +1
We study the mixing length concept in comparison to three-dimensional numerical calculations of convection with rotation. In a limited range, the velocity and temperature fluctuati…
Coronal heating through braiding of magnetic field lines
H. Peter, B. V. Gudiksen, A. Nordlund
Cool stars like our Sun are surrounded by a million degree hot outer atmosphere, the corona. Since more than 60 years the physical nature of the processes heating the corona to tem…