Discoveries of waves in dusty plasmas

2010 ◽  
Vol 77 (4) ◽  
pp. 437-455 ◽  
Author(s):  
A. A. MAMUN ◽  
P. K. SHUKLA
Keyword(s):  
Dusty Plasma ◽  
Acoustic Waves ◽  
Dusty Plasmas ◽  
Laboratory Plasma ◽  
Plasma Parameters ◽  
Ion Acoustic ◽  
Nonlinear Features ◽  
Linear And Nonlinear ◽  
Basic Characteristics ◽  
Basic Features

AbstractThe basic features of dusty plasmas, particularly basic characteristics of dust in a plasma, and typical dusty plasma parameters for different space and laboratory plasma conditions, are presented. The complexity and the diversity of the field of dusty plasma physics are briefly discussed. Theoretical and experimental discoveries of linear and nonlinear features of waves, particularly dust-ion-acoustic and dust-acoustic waves, in dusty plasmas are reviewed.

Electro-acoustic shock structures in dusty plasmas

2014 ◽  
Vol 80 (6) ◽  
pp. 877-883
Author(s):  
A. A. Mamun
Keyword(s):  
Dusty Plasma ◽  
Dusty Plasmas ◽  
Ion Acoustic ◽  
Dust Acoustic ◽  
Basic Features

Two types of electro-acoustic shock structures, namely dust-ion-acoustic (DIA) and dust-acoustic (DA) shock structures, formed in two different kind of dusty plasma systems have been theoretically investigated. The sources of dissipation, which are responsible for the formation of DIA and DA shock structures in these dusty plasma systems, are identified. The conditions for the formation of these shock structures and their new basic features are pinpointed. The implications of the results in experimental observations are also discussed.

Twisted waves and instabilities in a permeating dusty plasma

2018 ◽  
Vol 84 (2) ◽  
Author(s):  
S. Bukhari ◽  
S. Ali ◽  
S. A. Khan ◽  
J. T. Mendonca
Keyword(s):  
Dusty Plasma ◽  
Acoustic Waves ◽  
Poisson Model ◽  
Dusty Plasmas ◽  
Ion Acoustic Waves ◽  
Ion Acoustic ◽  
Instability Growth ◽  
Existence Conditions ◽  
Dust Ion Acoustic Waves ◽  
Model Equations

New features of the twisted dusty plasma modes and associated instabilities are investigated in permeating plasmas. Using the Vlasov–Poisson model equations, a generalized dispersion relation is obtained for a Maxwellian distributed plasma to analyse the dust-acoustic and dust-ion-acoustic waves with finite orbital angular momentum (OAM) states. Existence conditions for damping/growth rates are discussed and showed significant modifications in twisted dusty modes as compared to straight propagating dusty modes. Numerically, the instability growth rate, which depends on particle streaming and twist effects in the wave potential, is significantly modified due to the Laguerre–Gaussian profiles. Relevance of the study to wave excitations due to penetration of solar wind into cometary clouds or interstellar dusty plasmas is discussed.

Linear and nonlinear ion-acoustic waves in very dense magnetized plasmas

2008 ◽  
Vol 15 (8) ◽  
pp. 082303 ◽  
Author(s):  
S. A. Khan ◽  
S. Mahmood ◽  
H. Saleem
Keyword(s):  
Acoustic Waves ◽  
Magnetized Plasmas ◽  
Ion Acoustic Waves ◽  
Ion Acoustic ◽  
Linear And Nonlinear

scholarly journals Electrostatic shock properties inferred from AKR fine structure

2003 ◽  
Vol 10 (1/2) ◽  
pp. 87-92 ◽  
Author(s):  
R. Pottelette ◽  
R. A. Treumann ◽  
M. Berthomier ◽  
J. Jasperse
Keyword(s):  
Electric Fields ◽  
Acoustic Waves ◽  
Sagdeev Potential ◽  
Plasma Parameters ◽  
Fluid Approximation ◽  
Auroral Kilometric Radiation ◽  
Ion Acoustic ◽  
Electron Holes ◽  
Spectral Frequency ◽  
Electron Acoustic

Abstract. The auroral kilometric radiation (AKR) consists of a large number of fast drifting elementary radiation events that have been interpreted as travelling electron holes resulting from the nonlinear evolution of electron-acoustic waves. The elementary radiation structures sometimes become reflected or trapped in slowly drifting larger structures where the parallel electric fields are located. These latter features have spectral frequency drifts which can be interpreted in terms of the propagation of shock-like disturbances along the auroral field line at velocities near the ion-acoustic speed. The amplitude, speed, and shock width of such localized ion-acoustic shocks are determined here in the fluid approximation from the Sagdeev potential, assuming realistic plasma parameters. It is emphasized that the electrostatic potentials of such nonlinear structures contribute to auroral acceleration.

scholarly journals Effects of Boundary and Electron Inertia on the Ion Acoustic Wave in a Plasma: A Pseudopotential Approach

1998 ◽  
Vol 51 (1) ◽  
pp. 113 ◽  
Author(s):  
K. K. Mondal ◽  
S. N. Paul ◽  
A. Roy Chowdhury
Keyword(s):  
Acoustic Waves ◽  
Finite Geometry ◽  
Cylindrical Domain ◽  
Plasma Parameters ◽  
Ion Acoustic Waves ◽  
Ion Acoustic Wave ◽  
Electron Inertia ◽  
Ion Acoustic ◽  
Pseudopotential Approach ◽  
Range Of Values

A pseudopotential approach is used to analyse the propagation of ion-acoustic waves in a plasma bounded by a cylindrical domain. The effect of the finite geometry is displayed both analytically and numerically. The phase velocity of the wave is determined and its variation is studied with respect to the plasma parameters. It is observed that the pseudopotential shows a wide variation of shape due to the imposition of a finite boundary condition. It is shown that if the other parameters are kept within a certain range of values, then the trapping of particles is favoured when the presence of the boundary is taken into account.

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