  The dissipative electron-ion-pcd (positively charged dust) plasma, which is
observed in both space and laboratory plasmas, is considered. The basic
features of nonplanar cylindrical and spherical ion-acoustic subsonic shock
waves in such a medium are investigated by deriving a modified Burgers equation
using the reductive perturbation method. It is found that the stationary pcd
species reduces the phase speed of the ion-acoustic waves, and consequently
supports the subsonic shock waves due to the kinematic viscosity (acting as a
source of dissipation) of the ion species. It is observed that the cylindrical
and spherical subsonic shock waves evolve with time very significantly, and
that the time evolution of the spherical shock structures is faster than that
of the cylindrical ones. The implications of the results of the work to space
and laboratory plasmas are discussed.
