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Characteristic parameters of drift vortices coupled to Alfvén waves in an inhomogeneous space plasma
David Sundkvist1, Stuart D Bale
1Space Sciences Laboratory, University of California, Berkeley, 7 Gauss Way, Berkeley, California 94720, USA. sundkvist@ssl.berkeley.edu
Abstract:
We present detailed measurements of ion scale vortices of drift type coupled to Alfvén waves in an inhomogeneous and collisionless space magnetoplasma. The two free parameters of a dipolar vortex, intensity and spatial radius, are measured. The vortices are driven by a strong density gradient on a boundary layer with scale size of the same order as the vortex diameter. Observations of vortices off the gradient show that symmetry-breaking conditions in a real inhomogeneous plasma can lead not only to cross-field but also to cross-boundary anomalous transport of particles and energy.
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