Berlin 2014 – wissenschaftliches Programm
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SYPA: Symposium Plasma-Astrophysik
SYPA 1: Plasma Astrophysics
SYPA 1.6: Vortrag
Donnerstag, 20. März 2014, 17:00–17:15, SPA Kapelle
Turbulent heating of charged particles in imbalanced plasma turbulence — •Martin S. Weidl1,2, Bogdan Teaca2,3,4, and Frank Jenko1,2 — 1Max-Planck-Institut für Plasmaphysik, EURATOM-Assoziation, Boltzmannstraße 2, 85748 Garching, Germany — 2Max-Planck/Princeton Center for Plasma Physics — 3Applied Mathematics Research Centre, Coventry University, Coventry CV1 5FB, United Kingdom — 4Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Straße 2, 37191 Katlenburg-Lindau, Germany
Astrophysical plasmas such as the solar wind often exhibit characteristics of imbalanced magnetohydrodynamic (MHD) turbulence, in which the fluctuations of the bulk velocity and the magnetic field are strongly correlated. As a result, the spatial structure and the strength of the electric field changes compared to the more commonly studied case of balanced turbulence.
We study the transport and acceleration properties of charged particles in imbalanced MHD turbulence by performing test particle simulations in parallel with three-dimensional MHD simulations. The cross-helicity level, measuring the degree of imbalance of the MHD steady-state, is controlled by using a correlated forcing scheme for velocity and magnetic fields. We discuss the decrease of the turbulent heating rate in systems with non-zero cross-helicity and compare its scaling with theoretical predictions. Our results are expected to be relevant for any plasma in which turbulent heating is important, for example the heating of dust particles in the interstellar medium.