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首页> 外文期刊>Mathematical research letters: MRL >Electrostatic solitary structures in warm multi-ion dusty plasmas: The effect of an external magnetic field and nonthermal electrons
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Electrostatic solitary structures in warm multi-ion dusty plasmas: The effect of an external magnetic field and nonthermal electrons

机译:温暖多离子尘埃等离子体中的静电孤立结构:外部磁场和非热电子的效果

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摘要

Adopting a multi-fluid dynamical approach, the propagation of weakly nonlinear electrostatic solitary waves in a warm multi-ion dust plasma is investigated. In particular, a plasma is composed of positively and negatively charged ions and positively or negatively charged dust in the presence of superthermal electrons immersed in an external magnetic field. In the linear regime, two modes exist, namely, the slow and fast ion-acoustic modes. Employing the reductive perturbation technique, the governing equation of the nonlinear propagation for the electrostatic solitary pulse is derived. The polarity and structural characteristics (amplitude and width) of the localized electrostatic pulse in the plasma are thus analyzed for various values of relevant plasma configurations, namely, the degree of the superthermality (kappa), the magnetic field strength Omega(j), and the adiabatic ion thermal pressure coefficient sigma(j). Our investigations should be useful to better understand the characteristics of the low-frequency electrostatic solitary wave that are ubiquitous in the laboratory and space plasmas, where a warm dusty multi-ion plasma with the energetic (suprathermal) electrons exists and an external magnetic field is included.
机译:采用多流体动力学方法,研究了在温热的多离子粉尘等离子体中的弱非线性静电孤立波的传播。特别地,等离子体由正极和带负电的离子组成,并且在浸入外部磁场中的超热电子存在下是正面或带负电荷的粉尘。在线性状态下,存在两种模式,即慢速和快速离子声学模式。采用还原性扰动技术,推导出静电孤立脉冲的非线性传播的控制方程。因此分析了等离子体中局部静电脉冲中的局部静电脉冲的极性和结构特性(幅度和宽度),即相关等离子体配置的各种值,即高温(κ),磁场强度Omega(J),以及绝热离子热压系数Sigma(J)。我们的调查应该有助于更好地理解在实验室和空间等离子体中普遍存在的低频静电孤立波的特性,其中存在具有能量(上班)电子的温暖的多离子等离子体和外部磁场是有用的包括。

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