Low frequency dusty plasma modes in a uniform magnetic field

Low frequency electrostatic waves of dusty plasmas in a uniform magnetic field are investigated. Since in conventional experiment parameter ranges the dust particles can hardly be magnetized, a "moderately magnetized" assumption of magnetized electrons and ions and unmagnetized dust particles is applied to such dusty plasmas. Effects of the neutral gas damping and the ion drag force on dust particles are taken into account. In the frequency range of ion waves, both dust-ion-acoustic waves propagating parallel to the magnetic field and the ion cyclotron waves are damped due to the ion drag on dust particles. In the very low dust frequency range, a new mode of slow dust waves propagating across the field line is found. The mode is damped to zero frequency in the long wavelength range due to the neutral gas damping and ion drag. (C) 2002 American Institute of Physics.