Velocity shear driven electron skin size vortices

Citation
J. Vranjes et al., Velocity shear driven electron skin size vortices, PHYS PLASMA, 8(9), 2001, pp. 3913-3920
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS OF PLASMAS
ISSN journal
1070-664X → ACNP
Volume
8
Issue
9
Year of publication
2001
Pages
3913 - 3920
Database
ISI
SICI code
1070-664X(200109)8:9<3913:VSDESS>2.0.ZU;2-2
Abstract
Nonlinear electromagnetic perturbations in a nonuniform plasma are studied in the presence of nonuniform flows that are aligned either perpendicular o r parallel to the ambient magnetic field lines. Coherent structures with ty pical spatial scales of the order of the electron skin depth are found in t he form of a stationary tripolar vortex, and for spatial scales of the orde r of the electron Larmor radius at the ion temperature in the form of a vor tex chain. In both cases, the structures are driven and carried by the plas ma flow. In the case of a parallel flow, the dipolar vortex propagates perp endicular to the field lines. For plasma in the Earth's magnetotail, the so lutions presented here should be expected at spatial scales of the order of about 10-20 km. (C) 2001 American Institute of Physics.