Linear Properties of Dust‐Acoustic Waves in Viscous and Collisional Dusty Plasmas

ABSTRACT Linear properties of acoustic modes associated with dust‐acoustic waves (DAWs) has been examined in a dusty plasma medium containing inertial negatively charged dust species, non‐inertial ions following Maxwellian distribution and non‐inertial electrons following non‐extensive q ‐distribution. The dust kinematic viscosity and also the dissipation due to the dust‐neutral collision have been taken into consideration. The thermal effect of dust species is also taken into account. The linear dispersion relation (LDR) is derived by adopting the normal mode analysis and the linear properties of DAWs is studied for different plasma contexts. It is shown that the propagation zone for DAWs is significantly influenced by the dust‐neutral collision and also by the viscosity of dust species. The implications of our results are discussed elaborately in connection with Saturn's rings, Earth's noctilucent clouds (NLC) and DC discharge plasmas.