240 citations
- Novo Nordisk (Denmark)DK4 papers
- University of OuluFI4 papers
- University of CalgaryCA2 papers
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- Korea Information System (South Korea)KR1 paper
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- Norwegian University of Science and TechnologyNO1 paper
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6 papers
Radiative transfer in decomposed domains
T. Heinemann, W. Dobler, A. Nordlund +1
An efficient algorithm for calculating radiative transfer on massively parallel computers using domain decomposition is presented. The integral formulation of the transfer equation…
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…
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…
Helical coronal ejections and their role in the solar cycle
Axel Brandenburg, Christer Sandin, Petri J. Käpylä
The standard theory of the solar cycle in terms of an alpha-Omega dynamo hinges on a proper understanding of the nonlinear alpha effect. Boundary conditions play a surprisingly imp…