The nonlinear evolution of dust acoustic wave in magnetized dusty plasma was shown to obey the Davey-Stewartson I equation, which admits the so called dromion solutions.
Bohm criterion is revisited in the framework of a one-dimensional stationary and unmagnetized low-pressure argon and helium plasma mixture containing non-thermal electrons and dust grains model. Dust grains, electron non-thermality, and ions density ratio effects on Bohm velocities along with dust grain charge number |Φd0|, are investigated. It is revealed that Bohm velocities are highly correlated, with their profiles exhibiting a moving peak. Mixing the two gases allowed the appearance of subsonic (argon) as well as supersonic (helium) Bohm velocities. The present model may be generalized to many ion species plasmas.
The analysis of the excitation of the dust ion-acoustic (DIA) waves in a collisional dusty plasma by Merlino [IEEE Trans. Plasma Sci. 25, 60 (1997)] has been extended to include the dust charge fluctuations. A damping term arises in the growth rate. It is due to the grain charge variations.
A short pulse laser propagating through a preformed plasma exerts a radial ponderomotive force on the electrons and creates a low density plasma channel via ambipolar diffusion. If the radial intensity profile of the laser beam is clamped, i.e., assumed Gaussian in r with fixed half-width r0, then closed form analytic solution of the evolution of plasma density in the channel is obtained in the perturbation approximation, Δn≪n0, where Δn is the modification in electron density over its equilibrium value n0, by solving the linearized equation of continuity. The relevance of the channel for low spot size beams self-focusing is examined.
As free electrons move in the nearest neighbour ion’s potential well, the equilibrium velocity departs from Maxwell distribution. The effect of the non-Maxwellian velocity distribution function (NMVDF) on many properties of the plasma such as the transport coefficients, the kinetic energy, and the degree of ionization is found to be noticeable. A correction to the Langmuir wave dispersion relation is proved to arise due to the NMVDF as well [Phys. Plasmas 17, 052105 (2010)]. The study is extended hereafter to include the effect of NMVDF on the Landau damping of Langmuir wave.
In this work, the nonlinear evolution of dust acoustic wave in magnetized dust-ion plasma was investigated. The two component dusty plasma considered is valid as long as n e0 << Z d n d0 . We adopted reductive perturbation technique (RPT) to study the nonlinear evolution of these DAWs in two dimensions. It is shown that the governing equation for the two fluid systems is governed by the Davey-Stewartson I equation (DS) and may admit dromion solution . These solutions were illustrated for different cases (viz., Saturn's F ring, the tail of Halley's comet and laboratory). The amplitude and width of each dromion were also given.
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