5 papers
Hunting down the cause of solar magnetism
M. Viviani, A. Prabhu, J. Warnecke +4
To understand solar and stellar dynamos combining local and global numerical modelling with long-term observations is a challenging task: even with state of the art computational m…
Physically motivated heat conduction treatment in simulations of solar-like stars: effects on dynamo transitions
M. Viviani, M. J. Käpylä
Context. Results from global magnetoconvection simulations of solar-like stars are at odds with observations in many respects: They show a surplus of energy in the kinetic power sp…
Shapes of stellar activity cycles
T. Willamo, T. Hackman, J. J. Lehtinen +4
Magnetic activity cycles are an important phenomenon in both the Sun and other stars. The shape of the solar cycle is commonly characterised by a fast rise and a slower decline, bu…
Stellar dynamos in the transition regime: multiple dynamo modes and anti-solar differential rotation
M. Viviani, M. J. Käpylä, J. Warnecke +2
Global and semi-global convective dynamo simulations of solar-like stars are known to show a transition from an anti-solar (fast poles, slow equator) to solar-like (fast equator, s…
Effects of a subadiabatic layer on convection and dynamos in spherical wedge simulations
Petri J. Käpylä, Mariangela Viviani, Maarit J. Käpylä +2
We consider the effect of a subadiabatic layer at the base of the convection zone on convection itself and the associated large-scale dynamos in spherical wedge geometry. We use a…