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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2656
DTSTART:20120416T170500Z
DURATION:PT1H0M0S
DTSTAMP:20260413T133109Z
LAST-MODIFIED:20120412T194237Z
LOCATION:2535 Engineering Hall
SUMMARY:Kinetic Turbulence in Space and Astrophysical Plasmas: Theoret
 ical\, Numerical\, and Experimental Investigations\, Plasma Physics (P
 hysics/ECE/NE 922) Seminar\, Prof. Greg Howes\, University of Iowa
DESCRIPTION:In many turbulent space and astrophysical plasma environme
 nts\, the<br>
\ndissipation of the turbulence\, and consequent convers
 ion of turbulent<br>
\nfluctuation energy to plasma heat\, occurs at s
 cales on which the plasma<br>
\ndynamics is collisionless. Direct acce
 ss to the near Earth solar wind provides a<br>
\nunique opportunity to
  confront our understanding of the dynamics of kinetic<br>
\nplasma tu
 rbulence\, and its dissipation via collisionless damping mechanisms\,<
 br>
\nwith in situ spacecraft measurements. Significant effort has rec
 ently been<br>
\nfocused on employing the gyrokinetic formalism to stu
 dy the dissipation of<br>
\nturbulence in the solar wind\, taking adva
 ntage of sophisticated numerical<br>
\ntechniques developed for use in
  the fusion community. Here I will report on<br>
\nsome of the most re
 cent successes of this effort\, in particular the first threedimension
 al\,<br>
\nnonlinear gyrokinetic simulation of plasma turbulence resol
 ving<br>
\nscales from the ion to electron gyroradius with a realistic
  mass ratio\, where all<br>
\ndamping is provided by resolved physical
  mechanisms. Complementing this<br>
\ntheoretical and numerical resear
 ch program are experiments on the Large<br>
\nPlasma Device (LAPD) at 
 UCLA to measure the nonlinear interactions between<br>
\ncounterpropag
 ating Alfven waves\, the fundamental building block of Alfvenic<br>
\n
 plasma turbulence.
URL:https://www.physics.wisc.edu/events/?id=2656
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