Simulations of solar and stellar dynamos and their theoretical interpretation

PJ Käpylä, MK Browning, AS Brun, G Guerrero… - Space Science …, 2023 - Springer
We review the state of the art of three dimensional numerical simulations of solar and stellar
dynamos. We summarize fundamental constraints of numerical modelling and the …

Astrophysical turbulence modeling

A Brandenburg, Å Nordlund - Reports on Progress in Physics, 2011 - iopscience.iop.org
The role of turbulence in various astrophysical settings is reviewed. Among the differences
to laboratory and atmospheric turbulence we highlight the ubiquitous presence of magnetic …

Cyclic magnetic activity due to turbulent convection in spherical wedge geometry

PJ Käpylä, MJ Mantere… - The Astrophysical Journal …, 2012 - iopscience.iop.org
We report on simulations of turbulent, rotating, stratified, magnetohydrodynamic convection
in spherical wedge geometry. An initially small-scale, random, weak-amplitude magnetic …

Advances in mean-field dynamo theory and applications to astrophysical turbulence

A Brandenburg - Journal of Plasma Physics, 2018 - cambridge.org
Recent advances in mean-field theory are reviewed and applications to the Sun, late-type
stars, accretion disks, galaxies and the early Universe are discussed. We focus particularly …

Differential rotation in solar-like stars from global simulations

G Guerrero, PK Smolarkiewicz… - The Astrophysical …, 2013 - iopscience.iop.org
To explore the physics of large-scale flows in solar-like stars, we perform three-dimensional
anelastic simulations of rotating convection for global models with stratification resembling …

Transition from anti-solar to solar-like differential rotation: dependence on Prandtl number

PJ Käpylä - Astronomy & Astrophysics, 2023 - aanda.org
Context. Late-type stars such as the Sun rotate differentially due to the interaction of
turbulent convection and rotation. Aims. The aim of the study is to investigate the effects of …

Confirmation of bistable stellar differential rotation profiles

PJ Käpylä, MJ Käpylä, A Brandenburg - Astronomy & Astrophysics, 2014 - aanda.org
Context. Solar-like differential rotation is characterized by a rapidly rotating equator and
slower poles. However, theoretical models and numerical simulations can also result in a …

Effects of enhanced stratification on equatorward dynamo wave propagation

PJ Käpylä, MJ Mantere, E Cole… - The Astrophysical …, 2013 - iopscience.iop.org
We present results from simulations of rotating magnetized turbulent convection in spherical
wedge geometry representing parts of the latitudinal and longitudinal extents of a star. Here …

[图书][B] Magnetic processes in astrophysics: theory, simulations, experiments

G Rüdiger, R Hollerbach, LL Kitchatinov - 2013 - books.google.com
In this work the authors draw upon their expertise in geophysical and astrophysical MHD to
explore the motion of electrically conducting fluids, the so-called dynamo effect, and …

Reynolds stress and heat flux in spherical shell convection

PJ Käpylä, MJ Mantere, G Guerrero… - Astronomy & …, 2011 - aanda.org
Context. Turbulent fluxes of angular momentum and enthalpy or heat due to rotationally
affected convection play a key role in determining differential rotation of stars. Their …