Dynamics of nonlinearly interacting magnetic electron drift vortex modes in a nonuniform plasma
2009 (English)In: Physics of Plasmas, ISSN 1070-664X, Vol. 16, 042306- p.Article in journal (Refereed) Published
Asimulation study of dynamical evolution of nonlinearly interacting two-dimensional magneticelectron drift vortex (MEDV) modes in a nonuniform plasma ispresented. Depending on the equilibrium density and temperature gradients, thesystem can either be stable or unstable. The unstable systemreveals spontaneous generation of magnetic fields from noise level, andlarge-scale magnetic field structures are formed. When the system islinearly stable, one encounters MEDV mode turbulence in which thereis a competition between zonons (zonal flows) and streamers. Forlarge MEDV mode amplitudes, one encounters the formation of localizedand small-scale magnetic vortices and vortex pairs with scale sizesof the order of the electron skin depth. The MEDVturbulence exhibits nonuniversal (non-Kolmogorov-type) spectra for different sets of plasmaparameters. The relevance of this work to laboratory and cosmicplasmas is briefly mentioned.
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2009. Vol. 16, 042306- p.
IdentifiersURN: urn:nbn:se:umu:diva-24983DOI: 10.1063/1.3103785OAI: oai:DiVA.org:umu-24983DiVA: diva2:228473