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This Week at Physics

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Event Number 3682

  Friday, April 10th, 2015

Physics Department Colloquium
Joint Physics - Astronomy Colloquium
Kinetic and Gyrokinetic Astrophysical Turbulence Above and Below the Mirror and Firehose Stability Thresholds
Time: 12:00 pm
Place: 2241 Chamberlin Hall - Coffee and cookies at 11:45
Speaker: Matt Kunz, Princeton
Abstract: The solar wind is weakly collisional. As such, the particle populations that comprise it exhibit a variety of non-Maxwellian features, which are customarily described in terms of interspecies drifts and pressure anisotropies relative to the magnetic field direction. The solar wind is also turbulent, with a power spectrum extending over many orders of magnitude above and below the ion Larmor scale. These two facts, both well documented by the observational community, are not always treated on equal footing in concomitant theoretical work. Current gyrokinetic and reduced-MHD treatments of solar-wind turbulence take the plasma distribution to be Maxwellian. Analyses of pressure-anisotropy-driven Larmor-scale instabilities rarely focus on their contribution to the kinetic-scale turbulent cascade. These issues borne in mind, I will present some analytical and numerical efforts to construct a more suitable theoretical framework for describing inertial-range and Larmor-scale kinetic turbulence in non-Maxwellian astrophysical plasmas. Implications for turbulence in other weakly collisional environments, such as radiatively inefficient accretion flows and the intracluster medium, will also be discussed.

(coffee and cookies at 11:45)
Host: Boldyrev
Poster: http://www.physics.wisc.edu/twap/posters/2015/3682.pdf
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