Collisional charging of dust particles by suprathermal plasmas. II -- Regularized Kappa distributions

Abstract

We study the effects of the velocity distribution functions of the plasma particles on the equilibrium charge of dust grains, acquired through inelastic collisions of the particles with the grains. This paper is the second in a series of two papers on the subject. Here, we consider the charging process when the plasma particles are statistically described by the recently proposed regularized Kappa distribution functions, which allow for extreme suprathermal states, characterized by extremely low values of the kappa index, previously forbidden to the standard Kappa distributions, whose effects on dust charging were studied in Paper I of this series. We analyse the effects that extreme suprathermal states of the plasma particles have on dust charging and verify conditions for the uncommon result of positive equilibrium charge, employing two different models for the regularized Kappa distributions, one with kinetic temperature dependent on the kappa index, and another where the temperature is kappa-independent.

Accepted for publication in Physics of Plasmas

References in corpus (17)

• Electron energy partition across interplanetary shocks: I. Methodology and Data Product
• Charging of Aggregate Grains in Astrophysical Environments
• Plasma turbulence in the interstellar medium
• Physical correlations lead to kappa distributions
• Thermodynamics of the inner heliosheath
• On the Relation between Kappa Distribution Functions and the Plasma Beta Parameter in the Earth Magnetosphere: THEMIS observations
• Dust charge distribution in the interstellar medium
• The $\kappa$-cookbook: a novel generalizing approach to unify $\kappa$-like distributions for plasma particle modeling
• Dynamic Imprints of Colliding-wind Dust Formation from WR140
• Dynamical charging of interstellar dust particles in the heliosphere
• Electromagnetic ion-cyclotron instability in a dusty plasma with product-bi-kappa distributions for the plasma particles
• Towards a realistic evaluation of transport coefficients in non-equilibrium space plasmas
• Effects of dust particles charged by inelastic collisions and by photoionization on Alfvén waves in a stellar wind
• Discovery of double Hall pattern associated with collisionless magnetic reconnection in dusty plasmas
• Oblique Alfvén waves in a stellar wind environment with dust particles charged by inelastic collisions and by photoionization
• A dispersion function for the regularized kappa distribution function
• Group velocity of obliquely propagating Alfvén waves in a magnetized dusty plasma