Physics – Geophysics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm43a1211s&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM43A-1211
Physics
Geophysics
4400 Nonlinear Geophysics (3200, 6944, 7839), 4490 Turbulence (3379, 4568, 7863), 7829 Kinetic Waves And Instabilities, 7859 Transport Processes, 7863 Turbulence (4490)
Scientific paper
It is generally believed that spatially coherent vortex structures can spontaneously form in space and laboratory turbulent plasmas due to mode couplings of different scale perturbations. Although theoretical predictions on their properties are numerous, direct detailed measurements of such structures in turbulent plasmas have been absent. We unambiguously show for the first time the existence of spatially coherent drift-Alfvén vortices and vortex chains in a turbulent space plasma, using simultaneous multi-point measurements of the Cluster satellites in the magnetospheric cusp. Moreover we present clear indications that vortex structures exist on several spatial scales. The vortices represent ``elementary entities" of drift-Alfvén wave turbulence in magnetized plasmas and their presence has far-reaching implications on turbulent cross-field transport.
André Martial
Buchert Stephan
Kant Shukla Padma
Krasnoselskikh Vladimir
Reme Henri
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