Resumo

MARTIN, P; CASTRO, E; PUERTA, J  e  VALDEBLANQUEZ, E. Bi-dust acoustic waves. Rev. mex. fis. [online]. 2006, vol.52, suppl.3, pp.227-229. ISSN 0035-001X.

Low frequencies waves in plasmas with two kind of dusty grains have been studied. Each species of dust particle is characterized by the grain radius, which determines its equilibrium charge. Relative velocities between the two kinds of dust grain for the unperturbed plasma is also considered in order to study instabilities and compare with astrophysical and industrial applications. In this analysis, each dust species is handled with a simplified model of kinetic-fluid equations, and the electrons and ions are determined by Boltzmann factors. The low frequency dispersion relation for bi-dust plasma waves with non relative motion between each kind of grain leads to damped waves with two characteristic frequencies. Instabilities are produced by the relative motion between the species. The onset of these instabilities is studied as a function of the plasma dust frequencies and relative velocities among each species.

Palavras-chave : Dusty plasmas.

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