Würzburg 2018 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 4: Sun and Heliosphere II - Dynamics (MHD, Particles)

EP 4.5: Talk

Wednesday, March 21, 2018, 12:00–12:15, BSZ - Pabel HS

Regularized κ-distributions with non-diverging moments — •Klaus Scherer, Horst Fichtner, and Marian Lazar — Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany

For various plasma systems the so-called κ-distribution is widely used to describe suprathermal (non-relativistic) particle components exhibiting a power-law behaviour in velocity or energy. Despite its success the concept of the standard κ-distribution remains disputable because the latter is defined only for κ > 3/2 and possesses only a finite number of velocity moments v^l (with the integer l defining the l-th moment), some of which, i.e., l 2κ−1, are diverging. In order to resolve these limitations we introduce the regularized κ-distribution. After a discussion of its properties and its relation to the standard κ- as well as to the Maxwellian distribution, we provide a general analytical expression that enables to calculate all of its moments, and illustrate that only fluid results, that critically depend on these moments will change, but not those obtained within the framework of kinetic theory.