包含双温非热离子的尘埃等离子体中的三维尘埃声孤波

Three-dimensional dust-acoustic solitary waves in a dusty plasma with two-temperature nonthermal ions

考虑高阶横向扰动的因素,使用约化摄动方法得到描述含有双温非热离子的无磁化尘埃等离子体中的尘埃声波的(3+1)维KP方程.详细讨论一些尘埃等离子体系统参数如电子与非热高温离子数密度v与μh、快离子数λ(α)、低温非热离子与电子的温度比1β、非热双温离子温度比2β对尘埃声孤波性质的影响.研究结果表明:这些因素均可显著影响和改变孤波结构.在考虑双温非热离子后,稀疏形孤波与压缩形孤波的临界条件也发生极大变化.

Using the reductive perturbation method, we studied an unmagnetized dusty plasma with two- temperature nonthermal distributed ions under the higher order transverse perturbations, and obtained a （3 ＋ 1 ） dimendional Kadomtsev-Petviashvili （KP） equation for dust-acoustic solitary waves. The effects of the electrons number density v, the higher temperature nonthennal ions number density/zh , the fast ions λ （α） , the ratio of the temperatures of the lower temperature nonthermal ions and the electrons β1 , the ratio of the temperatures of the lower and the higher temperature nonthermal ions β2 on the properties of solitary waves were studied. The results suggested that these parameters could significantly influence the structures of the solitons. Moreover, eonsiding the two-temperature nonthermal ions, the critical transiton between rarefaetive and compressive solitary waves had change.