Abstract
The ion acoustic solitons have been investigated in an inhomogeneous two-temperature electron plasma in the presence of immobile dust particles. The modified Korteweg–de Vries equation with an additional term due to density gradients is deduced by employing reductive perturbation technique. It is noticed that the amplitude of the soliton is increased with the decrease in the positively charged dust concentration, while the soliton amplitude is increased with the increase in negatively charged dust concentration in such inhomogeneous plasmas. The equilibrium density profile is taken exponential type and density gradient effects on soliton formation are also studied. The numerical results are shown for illustration.
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