具有非等温电子和离子的等离子体中的调制尘埃声波波包
Modulated dust-acoustic wave packets in a plasma with non-isothermal electrons and ions
摘要:
研究了尘埃声波在非热(非麦克斯韦)离子和电子布居存在下的非线性自调制。通过采用多尺度技术,非线性薛定谔型方程(NLSE)的波动振幅推导。的非热性的影响,除了传播和调制方向之间的不稳定性,调制不稳定性发生的条件进行了讨论。不同类型的本地化的解决方案(包络激发)可能会发生的讨论,并跟踪其特性对物理参数的依赖。离子偏离麦克斯韦分布比单独的电子类似偏离更重要。两者都产生一个不稳定的影响(振幅)传播的DAWS在尘埃等离子体与负尘埃颗粒。相反的效果,即对振幅稳定的趋势,被发现的情况下,带正电的尘埃存在的等离子体。
英文摘要:
Nonlinear self-modulation of the dust acoustic waves is studied, in the presence of non-thermal (non-Maxwellian) ion and electron populations. By employing a multiple scale technique, a nonlinear Schrodinger-type equation (NLSE) is derived for the wave amplitude. The influence of non-thermality, in addition to obliqueness (between the propagation and modulation directions), on the conditions for modulational instability to occur is discussed. Different types of localized solutions (envelope excitations) which may possibly occur are discussed, and the dependence of their characteristics on physical parameters is traced. The ion deviation from a Maxwellian distribution comes out to be more important than the electron analogous deviation alone. Both yield a de-stabilizing effect on (the amplitude of) DAWs propagating in a dusty plasma with negative dust grains. The opposite effect, namely a tendency towards amplitude stabilization, is found for the case of positively charged dust presence in the plasma.
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