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P: Fachverband Plasmaphysik
P 11: Helmholtz Graduate School - Poster
P 11.21: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
Hybrid drift kinetic electron - kinetic ion computations for electrostatic fluctuations in astrophysical plasmas — •Karen Pommois1, Simon Lautenbac2, Daniel Told1, and Rainer Grauer2 — 1Max Planck Institut fur Plasmaphysik, Garching, Germany — 2Ruhr Universität, Bochum, Germany
Kinetic numerical simulations, applied to study local heating in the solar wind [1], are computationally expensive due to the different evolution scales involved in the dynamics. The dispersion relation of Alfvén wave and fast magnetic mode were found with different simplified models, such as hybrid fluid-kinetic and gyrokinetic, and were compared in a recent work [2]. It has emerged that hybrid kinetic is well suited to describe high frequency waves, on the other hand it misses electron kinetic effects even at ion scales. Instead, gyrokinetics is able to capture kinetic electron effects but limited to wave frequencies below the cyclotron frequencies of the species involved. Hence, to enlarge the range of frequency of validity of gyrokinetic model for simulations of astrophysical plasmas, we aim to implement a hybrid model that involves a gyrokinetic description for electrons and kinetic for ions. In this poster we will show the first results, where we implemented this new hybrid model in the case of electrostatic dynamics and drift-kinetic electrons in muphy [3], a framework designed to couple different numerical codes for solving plasma problems. References: [1] R. Bruno and V. Carbone. Living Rev. Solar Physics, 2(4), 2005. [2] D. Told et al. New J. Phys., 18(6):065011, 2016. [3] M. Rieke et al. J. Comput. Phys., 283:436-452, 2015.