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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-5364
DTSTART:20200213T213000Z
DTEND:20200213T110000Z
DTSTAMP:20260415T040923Z
LAST-MODIFIED:20200210T145028Z
LOCATION:4421 Sterling Hall\, Coffee and cookies 3:30 PM\, Talk begins
  3:45 PM
SUMMARY:Diffusion and dispersion in anisotropic magnetohydrodynamic tu
 rbulence\, Astronomy Colloquium\, Professor Jane Pratt\, Georgia State
  University\, Physics and Astronomy Deparment
DESCRIPTION:Diffusion and transport processes in turbulent plasmas con
 stitute fundamental astrophysical problems\; a clear understanding of 
 these processes is needed in order to produce improved theoretical mod
 els for the diffusion and transport of energetic particles\, including
  cosmic rays.<br>
\nMagnetohydrodynamic (MHD) turbulence structured by
  a large-scale magnetic field is an essential aspect of interstellar o
 r interplanetary plasmas.  Here we investigate how turbulent diffusion
  and dispersion differ in the directions parallel and perpendicular to
  the magnetic field.  We adopt the Lagrangian viewpoint\, the natural 
 point of view to study diffusion\, and construct statistics based on t
 he trajectories of Lagrangian tracer particles. From the motions of th
 ese tracer particles\, we evaluate Lagrangian statistics for single-pa
 rticle diffusion\, two-particle dispersion\,  and velocity autocorrela
 tions.  We also demonstrate new Lagrangian statistics developed to und
 erstand anisotropic turbulent dispersion.  Results will be presented f
 rom simulations with grid sizes up to 2048^3.<br>
\n<br>
\n-- 
URL:https://www.physics.wisc.edu/events/?id=5364
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