6 papers
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.…
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…
Mean Field Dynamos with Algebraic and Dynamic alpha-Quenchings
A. Tworkowski, E. Covas, R. Tavakol +1
Calculations for mean field dynamo models (in both full spheres and spherical shells), with both algebraic and dynamic --quenchings, show qualitative as well as quantitative dif…
In-out intermittency in PDE and ODE models of axisymmetric mean-field dynamos
Eurico Covas, Reza Tavakol, Peter Ashwin +2
Employing some recent results in dynamics of systems with invariant subspaces we find evidence in both truncated and full axisymmetric mean-field dynamo models of a recently discov…
Axisymmetric mean field dynamos with dynamic and algebraic --quenchings
Eurico Covas, Reza Tavakol, Andrew Tworkowski +1
We study axisymmetric mean field spherical and spherical shell dynamo models, with both dynamic and algebraic --quenchings. Our results show that there are qualitative as well a…
Dynamos with different formulations of a dynamic alpha-effect
Eurico Covas, Andrew Tworkowski, Axel Brandenburg +1
We investigate the behaviour of dynamos with a dynamic , whose evolution is governed by the imbalance between a driving and a damping term. We focus on truncated versions o…