1997/09/08 by Eurico Covas, Reza Tavakol, Covas, Eurico +5
Biochemistry, Genetics and Molecular Biology · Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Geology and Paleoclimatology Research #Geomagnetism and Paleomagnetism Studies #Solar and Space Plasma Dynamics #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9709062
Latex with full figures, also available on web page http://www.maths.qmw.ac.uk/~eoc; Astronomy and Astrophysics, accepted
arxiv created 1997/09/08 · openalex publication_date 1997/09/08 · arxiv updated 2009/12/01 · openalex created_date 2022/10/03 · openalex updated_date 2026/07/28
We study axisymmetric mean field spherical and spherical shell dynamo models, with both dynamic and algebraic α--quenchings. Our results show that there are qualitative as well as quantitative differences and similarities between these models. Regarding similarities, both groups of models exhibit symmetric, antisymmetric and mixed modes of behaviour. As regards differences, the important feature in the full sphere models is the occurrence of chaotic behaviour in the algebraic α--quenching models. For the spherical shell models with dynamic α the main features include the possibility of multi-attractor regimes with final state sensitivity with respect to small changes in the magnitude of α and the initial parity. We find the effect of introducing a dynamic α is likely to be complicated and depend on the region of the parameter space considered, rather than a uniform change towards simplicity or complexity.