Nonlinear structures associated with the kinetic Alfvén waves such as double layers (DLs) are investigated in a multicomponent plasma consisting of cold ions with superthermal electrons and positrons. The Sagdeev potential has been derived using two-potential theory in a low- β case. It is shown that our current consideration supports both compressive and rarefactive DLs. The effects of positron concentration and superthermality on DLs are studied. It is shown that the characteristics of the kinetic Alfvénic DLs, i.e., their profile is significantly modified due to superthermality and positron concentration. Our present investigation could be useful for understanding the kinetic Alfvénic DLs in the electron-positron-ion plasma with kappa distributed electrons and positrons.

中文翻译：

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超热和正电子浓度对低β电子-正电子离子等离子体中动力学Alfénic双层的影响

在由冷离子与过热电子和正电子组成的多组分等离子体中，研究了与Alfvén动力学波相关的非线性结构，例如双层（DLs）。Sagdeev势是在低β情况下使用二势理论推导的。结果表明，我们目前的考虑支持压缩和稀疏DL。研究了正电子浓度和过热度对DLs的影响。结果表明，动力学AlfvénicDL的特征（即，其分布）由于过热和正电子浓度而显着改变。我们目前的研究对于了解具有κ分布的电子和正电子的电子-正电子离子等离子体中的动力学AlfvénicDLs可能是有用的。