a1 Department of Physics, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh (email@example.com)
A dusty plasma consisting of cold and hot electrons, cold ions, and charge fluctuating isolated cold dust has been considered. It has been shown by a normal mode analysis that in such a dusty plasma there exists a new type of electrostatic perturbation mode due to the charge fluctuation of the isolated dust. The basic features of this new electrostatic perturbation mode, which are different from those of the electron-acoustic waves, have also been analytically identified. The implications of these results in both the space and laboratory dusty plasma conditions are briefly discussed.
(Received August 13 2008)
(Revised September 04 2008)
(Online publication October 16 2008)