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Solitary ion acoustic waves in a plasma with regularized κ-distributed electrons

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This work has been focused on the investigation of the existence conditions and the characteristics of ion acoustic soliton (IAS) in a plasma, which is composed of cold ions and… Click to show full abstract

This work has been focused on the investigation of the existence conditions and the characteristics of ion acoustic soliton (IAS) in a plasma, which is composed of cold ions and regularized κ-distributed electrons. It is found that the propagation speed of the IAS should be larger than the actual ion acoustic velocity in the model. When the superthermal spectral index κ > 1.5, there exists IAS with only positive potential. In that case, the impact of the cutoff parameter α on the IAS is rather small. When κ 0. It indicates that the regularized κ-distribution introduced by Scherer et al. (2017) can be relevant to the fluid description of the nonthermal plasma. The results obtained in the present study might be useful for the understanding of the nonlinear electrostatic phenomena in space plasmas.

Keywords: solitary ion; regularized distributed; ion acoustic; acoustic waves; distributed electrons

Journal Title: AIP Advances
Year Published: 2020

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