Dust Acoustic Waves In Dusty Plasma Research Articles

Higher order nonlinear dust-acoustic waves in a dusty plasma with dust of opposite polarity

The nonlinear propagation of dust-acoustic (DA) waves in an unmagnetized dusty plasma (containing positive and negatively charged inertial dust grains and nonextensive distributed electrons and ions) have been investigated theoretically. Three different types of nonlinear dynamical equations, namely, Korteweg-de Vries (K-dV), modified K-dV (mK-dV) and Gardner equations have been derived by employing the reductive perturbation method. The basic features (viz., polarity, amplitude, width, etc.) of solitary waves have been also analyzed numerically. It has been observed that the effects of nonextensivity of electrons and ions, mass and charge of positive and negative dust, and different dusty plasma parameters have significantly modified the fundamental properties of the solitary waves.

Generalized polarization force acting on charge fluctuating dust grains and its effects on propagation of dust-acoustic waves in a dusty plasma

The generalized expression for the polarization force (which mainly arises due to the polarization of plasma ions around the dust grains) acting on charge fluctuating dust grains has been derived. The effect of such generalized polarization force on the propagation of the dust-acoustic waves in such dusty plasma has been also examined. It has been found that both the real and imaginary parts of the dust-acoustic wave frequency are significantly modified by this generalized polarization force. The implications of our results in some real situations of space and laboratory dusty plasmas are briefly discussed.

Modified dust-acoustic waves in dusty plasma with Lennard-Jones potential

Dust-acoustic waves in a dusty plasma are investigated by solving the Vlasov equation including the effect of dust-dust interaction modeled by a Lennard-Jones-like potential. The latter contains a potential well and is applicable when thermionic or photo emission processes are important. It is shown that the excitation and linear dispersion of the dust-acoustic waves are strongly modified. In fact, the phase of the dust acoustic waves is shifted and a cut-off for the long-wavelength modes appears, leading to a purely growing instability.

Kinetic Theory of Dust-Acoustic Waves in Plasmas With Dust Distributions and Charge Fluctuations

Dust-acoustic waves in dusty plasmas are studied in a kinetic context incorporating dust distributions and charge fluctuations, two of the main features that distinguish dusty or complex from ordinary plasmas. This is done by deriving a generalized Vlasov equation in an extended phase space. No specific charging model is used so that the results are generic.

Nonlinear coupling between Langmuir and dust-acoustic waves in dusty plasmas with dust charge perturbations

The nonlinear coupling of high-frequency Langmuir waves with dusty plasma slow motions is considered, taking into account the dust charge perturbation. It is found that the latter modifies the spectra of both the high-and low-frequency wave motions as well as the coupling coefficients. Nonlinear dispersion relations for various types of parametric interactions are obtained and compared with previous investigations.

Nonlinear Coupling between Fast and Slow Dust-Acoustic Waves

The nonlinear coupling between fast and slow dust-acoustic waves in dusty plasmas has been considered.The multi-fluid equations have been used to derive a set of equations which is useful for studying the three-wave decay interaction as well as the modulational instability of the fast dust-acoustic waves