10 papers · 1 filter
Solar Cycle Variation of the Solar Internal Rotation: Helioseismic Inversion and Dynamo Modelling
S. Vorontsov, R. Tavakol, E. Covas +1
We report our first results on comparing the variations of the solar internal rotation with solar activity, as predicted by non-linear solar dynamo modelling, with helioseismic mea…
Aspects of the dynamics underlying solar and stellar dynamo models
Reza Tavakol, Eurico Covas
Observations of the Sun and solar-type stars continue to reveal phenomena whose understanding is very likely to require a nonlinear framework. Here we shall concentrate on two such…
Spatiotemporal fragmentation as a mechanism for different dynamical modes of behaviour in the solar convection zone
Eurico Covas, Reza Tavakol, David Moss
Recent analyses of the helioseismic observations indicate that the previously observed surface torsional oscillations with periods of about 11 years extend significantly downwards…
Torsional oscillations in the solar convection zone
Eurico Covas, Reza Tavakol, David Moss +1
Recent analysis of the helioseismic observations indicate that the previously observed surface torsional oscillations extend significantly downwards into the solar convection zone.…
Intermittency as a possible underlying mechanism for solar and stellar variability
Reza Tavakol, Eurico Covas
We briefly discuss the status of the intermittency hypothesis, according to which the grand minima type variability in solar-type stars may be understood in terms of dynamical inte…
The influence of geometry and topology on axisymmetric mean-field dynamos
E. Covas, R. Tavakol, A. Tworkowski +3
We study the changes in the dynamical behaviour of axisymmetric spherical mean-field dynamo models produced by changes in their geometry and topology, by considering a two paramete…