Ion acoustic solitary waves in superthermal plasmas are investigated in the presence of trapped electrons. The reductive perturbation technique is employed to obtain a forced Korteweg–de Vries-like Schamel equation. An analytical solution is obtained in the presence of externally applied force. The effect of the external applied periodic force is also observed. The effect of the spectral index (κ), the strength (f0), and the frequency (ω) on the amplitude and width of the solitary wave is obtained. The result may be useful in laboratory plasma as well as space environments.

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