Abstract

A theoretical investigation into the effect of negative ion population on dust acoustic wave propagation is presented in a self-gravitating dusty plasma consisting of electrons, negative ions, positive ions, and charged dust grains. The kappa distributed suprathermal electrons and Maxwellian ions are assumed. The inertial dust grain is assumed to have a variable charge which is negative or positive in the equilibrium condition depending on the population density of negative ion. A general fluid dispersion relation is derived by using continuity, momentum, and Poissons equations for electrostatic potential as well as gravitational potential. The analysis shows that the higher negative ion and suprathermal electron population favored the reduction of the decay rate when the equilibrium dust charge is negative. On the other hand, when the negative ion population increases, the equilibrium dust charge becomes positive. In this case, the negative ion and suprathermal electron population enhance the decay rate.

Graphical abstract

中文翻译：

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负离子种群对自吸引洛伦兹尘埃等离子体中尘埃声波传播的影响

摘要

在由电子，负离子，正离子和带电尘埃颗粒组成的自重尘埃等离子体中，对负离子种群对尘埃声波传播的影响进行了理论研究。假定了κ分布的超热电子和麦克斯韦离子。假设惯性粉尘颗粒具有可变电荷，根据负离子的种群密度，其在平衡条件下为负或正。通过对静电势以及重力势使用连续性，动量和泊松方程，可以得出一般的流体弥散关系。分析表明，当平衡尘埃电荷为负时，较高的负离子和超热电子种群有利于衰减速率的降低。另一方面，当负离子数量增加时，平衡粉尘电荷变为正电荷。在这种情况下，负离子和超热电子能提高衰减率。

图形概要