Mode-coupling of low-frequency electromagnetic waves in dusty plasmas with temperature anisotropy

• Autor(a) principal: Juli, Marcelo Camargo de
• Data de Publicação: 2007
• Outros Autores: Schneider, Ruth de Souza, Ziebell, Luiz Fernando, Gaelzer, Rudi
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/141721
• topic: Relações de dispersão; Poeira cósmica (plasma); Propagacao de ondas eletromagneticas em plasmas

This paper studies the effects of the presence of dust particles with variable charge, in fully ionized, homogeneous, magnetized plasma of electrons and ions, with the electrons and ions described by bi-Maxwellian distributions in the equilibrium. The dispersion relation and the absorption rate are obtained for low frequency waves, with frequencies much lower than the ion cyclotron frequency. Two branches are obtained, identified as the whistler branch and the branch of circularly polarized waves, featuring damping due to the Landau damping process and to the collisional charging of the dust particles. The effects of the anisotropy of temperature on the damping rate of low frequency waves, and on the mode coupling which was demonstrated to occur in the isotropic situation, are numerically investigated. The results obtained show that in the anisotropic case the point of mode coupling is displaced to different values of dust density, and that a new point of mode coupling may appear from the effect of the temperature anisotropy.