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arXiv 1809.00951physics.plasm-ph
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空间尘埃等离子体中异常波的产生

Generation of rogue waves in space dusty plasmas

M. H. Rahman, A. Mannan, N. A. Chowdhury, A. A. Mamun

摘要:

通过推导非线性薛定谔方程,从理论上研究了四分量尘埃等离子体系统(含惯性冷尘埃颗粒、热尘埃颗粒、无惯性非广延离子和电子)中尘埃声波的基本特征.所考虑的解析分析展示了两种类型的模式,即快速和慢速DA模式。快速DA模式的不稳定区域,可以通过临界波数($k_c$)识别,产生DA流氓波(DARW)。据观察,DARW的幅度和宽度显着修改各种等离子体参数。这些结果有助于理解空间尘埃等离子体系统(如土星F环)中DAW调制不稳定性和DARW产生的条件。

英文摘要:

The basic features of dust-acoustic (DA) waves (DAWs) in four component dusty plasma system (containing inertial cold and hot dust grains, inertialess non-extensive ions and electrons) have been theoretically investigated by deriving the nonlinear Schrödinger equation. The analytic analysis under consideration demonstrates two types of modes, namely, fast and slow DA modes. The unstable domain for the fast DA mode, which can be recognized by the critical wave number ($k_c$), gives rise to the DA rogue waves (DARWs). It is observed that the amplitude and width of the DARWs are significantly modified by various plasma parameters. The present results should be useful in understanding the conditions for modulational instability of DAWs and generation of DARWs in space dusty plasma systems like Saturn F-rings.

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