On the positron superthermality and ionic masses contributions on the wave behaviour in collisional space plasma

•Damped structures with critical behaviors in a four-component plasma fluid having positive and negative ions, non-thermal distributed positrons and electrons have been examined for related Earth’s ionosphere plasma parameters.•Effects of the positron density ratio, ionic mass ratio, electron density ratio, the index of non-thermality on the formation of both damped structures of compressive and rarefactive types are studied.•The results performed in this work may be usable in the plasma of (D-F) Earth’s ionosphere regions.