Magnetodynamics of a multicomponent (dusty) plasma. I. Rotation waves near low-frequency cutoff in a homogeneous medium

By considering one of the species of a two-ion species plasma to be massive charged dust particles, the origin of the low-frequency cutoff in a multispecies plasma is found to be a fluid rotation of the light component with a characteristic frequency, Omega(r) = (Zn-H/n(e))Omega(L), where n(H) and n(e) are densities of the heavy component and electrons, respectively, Z is the charge state of the heavy component, and Omega(L) is the light ion cyclotron frequency. A fluid resonance at omega = Omega(r) modifies the properties of plasma oscillations in the vicinity of the cutoff and gives rise to the rotation waves in a manner similar to the cyclotron waves. The presence of a heavy component leads to the nonlinear Schrodinger equation for the system. The nonlinear dynamics of such a system consists of a combination of strong and weak turbulence with strong turbulence dominating in the long wavelength and the weak turbulence dominating in the short wavelength. (c) 2005 American Institute of Physics.