On the effects of suprathermal populations in dusty plasmas: The case of dust-ion-acoustic waves

M. Lazar*, I. Kourakis, S. Poedts, H. Fichtner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Suprathermal populations with energetic distributions deviating from a standard Maxwellian are ubiquitous in dusty plasmas from space environments, as a proof that these systems are out of thermal equilibrium. The excess of free energy may have important implications in the relaxation processes by the plasma waves and fluctuations, as well as in their dissipation. In order to emphasize the effects of suprathermal populations a new realistic interpretation is proposed on the basis of an advanced Kappa modeling in accord with the observations. This article is focused on the kinetic description of dust-modified ion acoustic (DIA) waves in the presence of Kappa-distributed (suprathermal) particles. Our methodology follows closely recent considerations on the structural characteristics of Kappa distributions, contrasting the high-energy tails enhanced by the suprathermal populations with the Maxwellian (thermal) core of the distribution. The effects on DIA waves are found to be highly dependent on the nature of suprathermal particles: both the wave-frequency and Landau damping rate are inhibited by the suprathermal electrons, while the suprathermal ions have an opposite influence.

Original languageEnglish
Pages (from-to)1-9
JournalPlanetary and Space Science
Early online date21 Nov 2017
DOIs
Publication statusEarly online date - 21 Nov 2017

Keywords

  • Dust
  • Kappa distribution
  • Space plasmas
  • Suprathermal populations
  • Waves

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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