Effects of positive dust component on self-gravitational instabilities of electromagnetic waves in dusty plasmas

Contributions to Plasma Physics

2022

A theoretical investigation has been carried out for exploring different features of ion-acoustic solitary and shock waves in a three-component magnetized plasma containing a mixture of thermal and nonthermal (energetic) inertialess electrons, warm inertial ions, and positively charged stationary dust particles. The standard Korteweg-de Vries (Burgers) equation has been derived by employing the reductive perturbation method, and its solitary (shock) wave solution has been derived and examined analytically as well as numerically. The latter exhibits characteristic properties (amplitude, width, speed, and polarity) of the ion-acoustic solitary and shock waves. It has been shown that the ion-acoustic solitary and shock waves are significantly modified by different plasma parameters (viz. parameter measuring the ratio of dust charge density to ion charge density, parameter measuring the fraction of energetic electrons, parameter measuring ion or electron temperature, and the external magnetic field). The present investigation may help in understanding the physics of various nonlinear phenomena formed in many space plasma systems, (viz. earth's mesosphere, solar wind, and cometary tails) and laboratory devices (laboratory experiments

“…Though a number of authors have derived K‐dV Burgers equation using stretching of plasma parameters like viscosity parameter which is not physically appropriate. [ 64 ]…”

Section: Discussionmentioning

confidence: 99%

Nonlinear ion‐acoustic waves in magnetized plasmas in presence of energetic electrons and positively charged dust

Orani

Akter

Contributions to Plasma Physics

2022

“…The pure plasmas (electron-ion plasmas) are often contaminated by solid impurities like dust which are in general not neutral and become charged (either positively or negatively) [11] by absorbing positive ions or electrons [12][13][14][15]. Plasma can also contain a significant amount of neutral particles [16]. Ikezi [17,18] first pointed out a simple electron-ion plasma with a few micron-sized negatively charged dust grains which undergo strongly coupled regime due to high charge density and low temperature.…”

Section: Introductionmentioning

confidence: 99%

Formation of highly nonlinear dust-acoustic solitary waves due to high-temperature electrons and ions

Emamuddin

2019

J Theor Appl Phys

Self Cite

The nonlinear propagation of dust-acoustic solitary waves (DASWs) in an unmagnetized dusty plasma consisting of two distinct temperature ions, two distinct temperature electrons and mobile dust fluid has been investigated by employing reductive perturbation method. It has been assumed that the two distinct temperature ions follow the Maxwell-Boltzmann distribution and nonthermal (Cairn's) distribution separately while the two distinct temperature electrons follow the nonextensive (Tsallis) distribution and superthermal (Kappa) distribution separately. The system has been treated by deriving and solving a set of three highly nonlinear equations such as K-dV, modified K-dV and Gardner equations. It has been noted that the basic properties of the DASWs are significantly modified by the presence of the nonthermal ions, nonextensive electrons and superthermal electrons. The possible applications of this investigation in astrophysical, space and laboratory plasma systems have also been briefly addressed.

Dust-acoustic shock waves in a dusty plasma with non-thermal ions and super-thermal electrons

Emamuddin

2018

Physics of Plasmas

The propagation of dust-acoustic shock waves (DASWs) in a collisionless unmagnetized dusty plasma (containing super-thermal electrons of two distinct temperatures, non-thermal ions, and a negatively charged viscous dust fluid) has been theoretically investigated by deriving and solving the nonlinear Burgers' equation. It has been observed that the viscous force acting on the dust fluid is a source of dissipation, and is responsible for the formation of DASWs, and that the basic features (viz., amplitude, polarity, width, etc.) of the DASWs are significantly modified by the presence of super-thermal electrons and non-thermal ions. The possible applications of this investigation in Earth's mesosphere, the solar atmosphere, Saturn's magnetosphere, etc., have also been briefly addressed.