München 2019 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 4: Sun and Heliosphere II

EP 4.5: Vortrag

Mittwoch, 20. März 2019, 12:30–12:45, HS 19

Linear Dispersion Theory with Regularised κ-Distributions: Overcoming Defiencies of Standard κ-Distributions — •Edin Husidic — Institut für Theoretische Physik, Lehrstuhl IV: Plasma-Astroteilchenphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany

The velocity distributions of the plasma populations in the solar wind deviate from Maxwellian distributions, showing enhanced suprathermal tails, which can be well described with the standard κ-distribution function (SKD). However, due to diverging velocity moments, the SKD is only defined for values κ > 3/2. To remove this unphysical characteristic and the limitations of the SKD, the regularised κ-distribution function (RKD), for which all velocity moments converge and which can reproduce as limiting cases both the bi-Maxwellian and the SKD, has been introduced recently (Scherer et al. 2018). Using the grid-based kinetic dispersion relation solver LEOPARD (Astfalk and Jenko 2017), for the first time the dispersion curves and the growth and damping rates of different plasma instabilities are computed for plasma populations characterised by RKDs. The results are compared to those obtained earlier for SKDs. The implications of the study and newly opened perspectives by use of the RKD are discussed.