Nonlinearity in a dynamo

0355538 - GFÚ 2011 RIV GB eng J - Journal Article
Hejda, Pavel - Reshetnyak, M.
Nonlinearity in a dynamo.
Geophysical and Astrophysical Fluid Dynamics. Roč. 104, č. 5-6 (2010), s. 491-504. ISSN 0309-1929. E-ISSN 1029-0419
R&D Projects: GA AV ČR IAA300120704
Institutional research plan: CEZ:AV0Z30120515
Keywords : Boussinesq convection * geostrophy * quenching * triads
Subject RIV: DE - Earth Magnetism, Geodesy, Geography
Impact factor: 0.831, year: 2010

Using a rotating flat layer heated from below as an example, we consider effects which lead to stabilizing an exponentially growing magnetic field in magnetostrophic convection in transition from the kinematic dynamo to the full non-linear dynamo. We present estimates of the energy redistribution over the spectrum and helicity quenching by the magnetic field. We also study the alignment of the velocity and magnetic fields. These regimes are similar to those in planetary dynamo simulations.
Permanent Link: http://hdl.handle.net/11104/0194286