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Dynamics of nonlinearly interacting magnetic electron drift vortex modes in a nonuniform plasma
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2009 (English)In: Physics of Plasmas, ISSN 1070-664X, Vol. 16, no 4, 042306- p.Article in journal (Refereed) Published
Abstract [en]

A simulation study of dynamical evolution of nonlinearly interacting two-dimensional magnetic electron drift vortex (MEDV) modes in a nonuniform plasma is presented. Depending on the equilibrium density and temperature gradients, the system can either be stable or unstable. The unstable system reveals spontaneous generation of magnetic fields from noise level, and large-scale magnetic field structures are formed. When the system is linearly stable, one encounters MEDV mode turbulence in which there is a competition between zonons (zonal flows) and streamers. For large MEDV mode amplitudes, one encounters the formation of localized and small-scale magnetic vortices and vortex pairs with scale sizes of the order of the electron skin depth. The MEDV turbulence exhibits nonuniversal (non-Kolmogorov-type) spectra for different sets of plasma parameters. The relevance of this work to laboratory and cosmic plasmas is briefly mentioned. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3103785]

Place, publisher, year, edition, pages
2009. Vol. 16, no 4, 042306- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-128987DOI: 10.1063/1.3103785ISI: 000266885800024OAI: oai:DiVA.org:uu-128987DiVA: diva2:332399
Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2010-08-05Bibliographically approved

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