In the present research paper, propagation attributes of nonlinear electron-acoustic (EA) waves have been investigated in an unmagnetised plasma system consisting of cool fluid electrons and hot electrons observing the hybrid Cairns–Tsallis distribution. Sagdeev pseudopotential method has been used to explore the occurrence of large-amplitude solitons and double layers, focussing on how their characteristics depend upon different parameters. The analysis is further extended to examine the dynamics of large- and small-amplitude double layers. It is revealed that the present plasma system supports the existence of negative potential solitons and double layers in certain region of parameter space. The numerical results show that the Cairns–Tsallis-distributed hot electrons may affect the spatial profiles of EA waves and double layers. The present investigation may be relevant to the observation from Viking satellite in the dayside auroral zone.

在本研究论文中，已经在由冷流体电子和热电子组成的非磁化等离子体系统中研究了非线性电子声波（EA）的传播属性，并观察了凯恩斯-塔尔利斯混合分布。Sagdeev伪势方法已用于探索大振幅孤子和双层的发生，重点在于它们的特性如何取决于不同的参数。该分析进一步扩展到检查大振幅和小振幅双层的动力学。揭示了本等离子体系统支持在参数空间的某些区域中存在负电势孤子和双层。数值结果表明，凯恩斯-塔利斯分布的热电子可能会影响EA波和双层的空间分布。