Statistics – Applications
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0762h&link_type=abstract
American Astronomical Society, HEAD meeting #9, #7.62; Bulletin of the American Astronomical Society, Vol. 38, p.359
Statistics
Applications
Scientific paper
The high temperature characteristic of black hole accretion disks means that dissipation of turbulence can occur on scales that are collisionless, even if the driving scale is collisional. Particle heating by this dissipation requires resolving the kinetic dynamics of the Landau resonance. Theories of magnetohydrodynamic (MHD) turbulence suggest that, at small scales, fluctuations become highly elongated along the direction of the magnetic field with frequencies small compared to the ion cyclotron frequency. Such turbulence is well described by a low-frequency expansion of kinetic theory called gyrokinetics. Here we describe efforts to study astrophysical turbulence using gyrokinetics, employing both analytical and numerical approaches, including a detailed understanding of the dissipation of the turbulence and consequent particle heating. We focus here on the implications of this research for radiatively inefficient accretion flows, but also mention applications of this approach to heating and resulting power spectra in the solar wind and to density fluctuations in the interstellar medium.
This work is supported by the DOE Center for Multi-scale Plasma Dynamics, Fusion Science Center Cooperative Agreement ER54785.
Cowley Steve C.
Dorland William
Hammett Gregory W.
Howes Gregory G.
Quataert Eliot
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