Abstract
The propagation of nonlinear dust-acoustic waves in inhomogeneous dusty plasmas consisting of electrons, ions, and charged dust particles is investigated. The grain charge fluctuation effect is also incorporated through the current balance equation. By using the perturbation method, a modified KdV equation governing the nonlinear behavior of the system is obtained. It has been shown that with the combined effects of dust number density inhomogeneous and the dust charge fluctuation would modify the wave structures. Amplitudes of the dust-acoustic waves decrease (increase) as the waves propagate in the direction of increasing (decreasing) dust number density.
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