Bonn 2010 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 7: Fundamental Physics

EP 7.2: Vortrag

Dienstag, 16. März 2010, 15:15–15:30, AKM

Compressible MHD turbulence — •Christian Vogel1,2 and Wolf-Christian Müller11Max-Planck-Institut für Plasmaphysik, Garching, Germany — 2Excellence Cluster Universe, Technische Universität München, Boltzmannstr. 2, D-85748, Garching, Germany

Understanding compressible MHD turbulence is key to describing compressible magnetized turbulent flows observed in astrophysical plasmas such as the interstellar medium. We present spectral scaling relations of supersonic and super-Alfvénic compressible MHD turbulence. Results of numerical simulations of the isothermal compressible MHD equations are compared to predictions of the Fleck model of compressible hydrodynamic turbulence. This includes self-similar scaling exponents of the turbulent velocity, the kinetic energy, and the density-weighted velocity over a range of sonic Mach numbers from subsonic flows to highly supersonic flows. Random large-scale driving of the velocity field and the magnetic field is used to keep the system in a statistically steady state. Additionally, we discuss the differing role of the non-linear turbulent energy transport in compressible and incompressible MHD turbulence.

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