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SUMMARY:Observational evidence for anisotropic solar wind turbulence on fl
 uid and kinetic scales - Horbury\, T (Imperial College\, London)
DTSTART:20100719T103000Z
DTEND:20100719T111500Z
UID:TALK25557@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The interaction between small scale turbulence (of the order o
 f the ion Larmor radius) and meso scale magnetic islands is investigated w
 ithin the gyrokinetic framework. Turbulence\, driven by background tempera
 ture and density gradients\, over nonlinear mode coupling\, pumps energy i
 nto long wave length modes\, and can result in an electrostatic vortex mod
 e that coincides with the magnetic island. The strength of the vortex is s
 trongly enhanced by the modified plasma flow response connected with the c
 hange in topology\, and the transport it generates can compete with the pa
 rallel motion along the perturbed magnetic field. Density and temperature 
 gradients inside the island are below the threshold for turbulence generat
 ion\, and the anomalous transport inside the island is determined by turbu
 lence spreading. A finite radial temperature gradient inside the island is
  observed to persist despite the fast motion along the field\, and is rela
 ted to the trapped particles which do not move along the field around the 
 island. Consequences for the stability of the neo-classical tearing mode a
 re discussed.
LOCATION:Seminar Room 1\, Newton Institute
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