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Weakly nonlinear ion sound waves in gravitational systems
Physical Review E ( IF 2.4 ) Pub Date : P. Guio and H. L. Pécseli
Physical Review E ( IF 2.4 ) Pub Date : P. Guio and H. L. Pécseli
Ion sound waves are studied in a plasma subject to gravitational field {giving rise to vertically inhomogeneous steady state plasma conditions}. Such systems are interesting by exhibiting a wave growth that is a result of energy flux conservation {for pulses propagating in an inhomogeneous system. The increase of the amplitude of a pulse as it propagates along the density gradient in the direction of decreasing density} gives rise to an enhanced interaction between waves and plasma particles that can be modeled by a modified Korteweg-de Vries equation. Analytical results are compared with numerical Particle-in-Cell simulations of the problem. Our code assumes isothermally Boltzmann distributed electrons {resulting in a nonlinear Poisson equation.} The ion component is treated as a collection of individual particles interacting through collective electric fields. Deviations from quasi neutrality are allowed for.
中文翻译:
重力系统中的弱非线性离子声波
在受引力场{产生垂直不均匀稳态等离子体条件}的等离子体中研究离子声波。通过表现出由于能量通量守恒(对于非均质系统中传播的脉冲)而产生的波动,这种系统非常有趣。当脉冲沿密度梯度沿密度减小的方向传播时,其振幅的增加导致波与等离子体粒子之间的相互作用增强,这可以通过修改的Korteweg-de Vries方程进行建模。将分析结果与该问题的数值单元中粒子模拟进行比较。我们的代码假设等温玻尔兹曼分布电子{导致非线性泊松方程。}离子成分被视为通过集体电场相互作用的单个粒子的集合。允许偏离准中立。
更新日期:2020-03-26
中文翻译:
重力系统中的弱非线性离子声波
在受引力场{产生垂直不均匀稳态等离子体条件}的等离子体中研究离子声波。通过表现出由于能量通量守恒(对于非均质系统中传播的脉冲)而产生的波动,这种系统非常有趣。当脉冲沿密度梯度沿密度减小的方向传播时,其振幅的增加导致波与等离子体粒子之间的相互作用增强,这可以通过修改的Korteweg-de Vries方程进行建模。将分析结果与该问题的数值单元中粒子模拟进行比较。我们的代码假设等温玻尔兹曼分布电子{导致非线性泊松方程。}离子成分被视为通过集体电场相互作用的单个粒子的集合。允许偏离准中立。