Hannover 2020 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 19: Helmholtz Graduate School 4 and Magnetic confinement 4
P 19.3: Vortrag
Donnerstag, 12. März 2020, 11:50–12:15, b305
Hybrid driftkinetic-kinetic implementations and simulations for uniform magnetized space plasma. — •Karen Pommois1, Simon Lautenbach2, Florian Allmann-Rahn2, Aleksandr Mustonen1, Felippe Nathan De Oliveira1, Rainer Grauer2, and Daniel Told1 — 1Max-Planck-Institut für Plasmaphysik, Boltzmannstrasse 2, 85748 Garching — 2Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum
Kinetic numerical simulations, applied to study local heating in the solar wind, are computationally expensive due to the different evolution scales involved in the dynamics. Therefore, simplified models, such as hybrid fluid-kinetic and gyrokinetic, are widely employed. Gyrokinetics is missing waves with frequencies above the cyclotron frequencies of the species involved and can be applied only to cases of strong magnetization and where the magnetic moment is conserved. Instead, the hybrid-fluid model is missing electron kinetic effects, important even at ion scales. Consequently, we are working on a new computationally lighter hybrid model, composed of kinetic ions and driftkinetic electrons in an uniform magnetic field. The distribution functions are evolved through semilagrangian schemes separately for ions and electrons and coupled through the field, evolved using a domain decomposition method and an iterative scheduled relaxation method. In particular, we are interested in studying the stochastic heating at low beta, where the non conservation of the magnetic moment of ions breaks the gyrokinetic description for ions while electron landau damping do not ensure the validity of fluid description for electrons.