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首页> 外文期刊>Physics of plasmas >Dust-acoustic solitary waves and double layers in a magnetized dusty plasma with nonthermal ions and dust charge variation
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Dust-acoustic solitary waves and double layers in a magnetized dusty plasma with nonthermal ions and dust charge variation

机译：具有非热离子和粉尘电荷变化的磁化粉尘等离子体中的粉尘声孤立波和双层

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The effect of nonthermal ions and variable dust charge on small-amplitude nonlinear dust-acoustic (DA) waves is investigated. It is found that both compressive and rarefactive solitons exist and depend on the nonthermal parameter a. Using a reductive perturbation theory, a Zakharov-Kuznetsov (ZK) equation is derived. At critical value of a, a(c), a modified ZK equation with third- and fourth-order nonlinearities, is obtained. Depending on a, the solution of the evolution equation reveals whether there is coexistence of both compressive and rarefactive solitary waves or double layers (DLs) with the possibility of their two kinds. In addition, for certain plasma parameters, the solitary wave disappears and a DL is expected. The variation of dust charge number, wave velocity, and soliton amplitude and its width against system parameters is investigated for the DA solitary waves. It is shown that the incorporation of both the adiabatic dust-charge variation and the nonthermal distributed ions modifies significantly the nature of DA solitary waves and DA DLs. The findings of this investigation may be useful in understanding the ion acceleration mechanisms close to the Moon and also enhances our knowledge on pickup ions around unmagnetized bodies, such as comets, Mars, and Venus. (c) 2005 American Institute of Physics.
机译：研究了非热离子和可变粉尘电荷对小振幅非线性粉尘声波（DA）的影响。发现压缩孤子和稀疏孤子同时存在并取决于非热参数a。使用归纳摄动理论，推导了Zakharov-Kuznetsov（ZK）方程。在a的临界值a（c）下，获得了具有三阶和四阶非线性的修正ZK方程。取决于a，演化方程的解揭示了压缩和稀疏孤波或双层（DLs）是否同时存在，并且存在两种可能性。另外，对于某些血浆参数，孤立波消失，并且期望DL。研究了DA孤波的尘埃电荷数，波速，孤子振幅及其宽度对系统参数的变化。结果表明，绝热粉尘电荷变化和非热分布离子的结合显着改变了DA孤波和DA DL的性质。这项研究的发现可能有助于理解靠近月球的离子加速机制，并且还可以增强我们对未磁化物体（如彗星，火星和金星）周围的离子的认识。 （c）2005年美国物理研究所。

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