Hydromagnetic dynamos in rotating spherical fluid shells in dependence on the Prandtl number and stratification

0363808 - GFÚ 2012 RIV GB eng J - Journal Article
Šimkanin, Ján - Hejda, Pavel
Hydromagnetic dynamos in rotating spherical fluid shells in dependence on the Prandtl number and stratification.
Geophysical Journal International. Roč. 185, č. 2 (2011), s. 637-646. ISSN 0956-540X. E-ISSN 1365-246X
R&D Projects: GA AV ČR IAA300120704; GA MŠMT LA09015
Institutional research plan: CEZ:AV0Z30120515
Keywords : dynamo * theories and simulations * composition of the core * planetary interiors
Subject RIV: DE - Earth Magnetism, Geodesy, Geography
Impact factor: 2.420, year: 2011

his paper investigates the dependence of hydromagnetic dynamos on the thermal and viscous diffusion processes and stratification. We analyse cases when thermal and viscous diffusion processes equally affect the dynamo action and when thermal diffusion processes dominate over viscous ones. The spherical shell is considered to be stratified either uniformly or non-uniformly. In the case of non-uniform stratification, the upper thin subshell is stably stratified and the lower subshell is unstably stratified, while for uniform stratification the whole shell is unstably stratified. In all the investigated cases, the generated magnetic field is dipolar.
Permanent Link: http://hdl.handle.net/11104/0199465