Ahmed N, Mannan A, Chowdhury N A, Mamun A A
Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh.
Chaos. 2018 Dec;28(12):123107. doi: 10.1063/1.5061800.
A nonlinear Schrödinger equation is derived to investigate the modulational instability of ion-acoustic (IA) waves (IAWs) in a double pair plasma system containing adiabatic positive and negative ion fluids along with super-thermal electrons and positrons. The analytical analysis predicts two types of modes, viz., fast ( ) and slow ( ) IA modes. The possible stable and unstable parametric regions for the IAWs in the presence of external perturbation can be observed for both and . The number density of the negative ions and positrons plays a vital role in generating the IA rogue waves in the modulationally unstable region. The applications of our present work in astrophysical environments [viz., D-region (H , O ) and F-region (H , H ) of the Earth's ionosphere] and in laboratory plasmas [viz., pair-ion fullerene (C , C )] are pinpointed.
推导了一个非线性薛定谔方程，以研究包含绝热正负离子流体以及超热电子和正电子的双对等离子体系统中离子声波（IAWs）的调制不稳定性。解析分析预测了两种模式，即快（ ）和慢（ ）IA模式。对于 和 ，都可以观察到在外部扰动存在下IAWs可能的稳定和不稳定参数区域。负离子和正电子的数密度在调制不稳定区域中产生IA rogue波方面起着至关重要的作用。指出了我们目前工作在天体物理环境[即地球电离层的D区（H ，O ）和F区（H ，H ）]以及实验室等离子体[即双离子富勒烯（C ，C ）]中的应用。
