Astrophysical magnetic field and nonlinear dynamo theory
- A. Brandenburg, K. Subramanian
- Chemistry
- 4 May 2004
Dynamo-generated Turbulence and Large-Scale Magnetic Fields in a Keplerian Shear Flow
- A. Brandenburg, Å. Nordlund, R. Stein, U. Torkelsson
- Physics
- 1 June 1995
The nonlinear evolution of magnetized Keplerian shear ows is simulated in a local, three-dimensional model, including the eeects of compressibility and stratiication. Supersonic ows are initially…
The Inverse Cascade and Nonlinear Alpha-Effect in Simulations of Isotropic Helical Hydromagnetic Turbulence
- A. Brandenburg
- Physics
- 13 June 2000
A numerical model of isotropic homogeneous turbulence with helical forcing is investigated. The resulting flow, which is essentially the prototype of the α2 dynamo of mean field dynamo theory,…
Time Evolution of the Magnetic Activity Cycle Period
- A. Brandenburg, S. Saar, Christen R. Turpin
- Physics
- 30 March 1998
We propose a new interpretation of the relationships between the dynamo cycle period (Pcyc) as observed in Ca II H and K, the rotational period (Prot), the activity level, and other stellar…
Simulations of nonhelical hydromagnetic turbulence.
- N. Haugen, A. Brandenburg, W. Dobler
- PhysicsPhysical review. E, Statistical, nonlinear, and…
- 2 July 2003
The bottleneck effect is shown to be equally strong both for magnetic and nonmagnetic turbulence, but it is far weaker in one-dimensional spectra that are normally studied in laboratory turbulence.
Galactic Magnetism: Recent developments and perspectives
- R. Beck, A. Brandenburg, D. Moss, A. Shukurov, D. Sokoloff
- Physics
- 1 September 1996
▪ Abstract We discuss current observational and theoretical knowledge of magnetic fields, especially the large-scale structure in the disks and halos of spiral galaxies. Among other topics, we…
A Supernova-regulated Interstellar Medium: Simulations of the Turbulent Multiphase Medium
- M. Korpi, A. Brandenburg, A. Shukurov, I. Tuominen, Å. Nordlund
- Physics
- 18 February 1999
The dynamic state of the interstellar medium, heated and stirred by supernovae (SNe), is simulated using a three-dimensional, nonideal MHD model in a domain extended 0.5×0.5 kpc horizontally and 2…
The Case for a Distributed Solar Dynamo Shaped by Near-Surface Shear
- A. Brandenburg
- Physics, Geology
- 15 February 2005
Arguments for and against the widely accepted picture of a solar dynamo being seated in the tachocline are reviewed, and alternative ideas concerning dynamos operating in the bulk of the convection…
Magnetic Diffusivity Tensor and Dynamo Effects in Rotating and Shearing Turbulence
- A. Brandenburg, K. Rädler, M. Rheinhardt, P. Käpylä
- Physics
- 22 October 2007
The turbulent magnetic diffusivity tensor is determined in the presence of rotation or shear. The question is addressed whether dynamo action from the shear-current effect can explain large-scale…
Minimal tau approximation and simulations of the alpha effect
- A. Brandenburg, K. Subramanian
- Physics
- 10 April 2005
The validity of a closure called the minimal tau approximation (MTA), is tested in the context of dynamo theory, wherein triple correlations are assumed to provide relaxat ion of the turbulent…
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