Dust ion-acoustic surface waves and Landau damping in a semi-bounded Lorentzian plasma

Taejoon Kim; Myoung-Jae Lee
December 2008
Physics of Plasmas;Dec2008, Vol. 15 Issue 12, p123703
Academic Journal
Dust ion-acoustic surface waves propagating on the interface between a vacuum and a semi-bounded Lorentzian (kappa) plasma are kinetically investigated. For a collisionless and unmagnetized Lorentzian plasma, the dispersion relation shows that dust ion-acoustic surface modes are stable against small linear perturbation. The damping rates of the Lorentzian waves are generally increased as the superthermal particles are increased. The ion-to-electron density ratio also greatly enhances the damping rate. As the wave number becomes large, the damping of the wave is quickly decreased. The effects of superthermal particles and dust particles on the phase and the group velocities are discussed in this work as well.


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