Unstable mode of ion-acoustic waves with two temperature q-nonextensive distributed electrons

Bukhari, S.; Hussain, Nadeem; Ali, S.

doi:10.1088/1674-1056/abf641

Cited by 4 publications

(2 citation statements)

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“…. The axial Z (ξ zs ) and helical Z (ξ φ s ) plasma dispersion functions have the usual definitions [36]. It is important to mention here that helically phase-varying fields (electric and gravitational) not only modify the dispersive characteristics of waves but also alter the resonance conditions.…”

Section: Plasma Response Function With Finite Oammentioning

confidence: 99%

Low frequency twisted waves in a self-gravitating nonextensive complex plasma

Bukhari

Shahid

et al. 2023

New J. Phys.

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The effects of dust-dust self-gravitational force and nonextensive characteristics of plasma species on the low frequency twisted waves owing to the helical wave structure in complex (dusty) plasmas are analyzed. The electrons and ions of the plasma are modelled by nonextensive q-distribution function while massive dust particles are Maxwellian distributed. The self-gravitational effects are incorporated in the Vlasov equation of kinetic theory where perturbed distribution function, electrostatic and gravitational potentials are expressed with Laguerre-Gauss functions. The governing equations of kinetic theory are solved together under paraxial approximations. The dispersion relations and damping rates of twisted dust-acoustic waves (TDAWs) are obatined for two situations; a) super-extensivity (q<1) and b) sub-extensivity (q>1). The effects of self-gravity, nonextensivity and twist parameter significantly modified the basic features of dust-acoustic waves. This study contributes to our understanding of the complex dynamics of twisted dust-acoustic waves in interstellar dust clouds, considering the interplay of self-gravity, nonextensivity, and helical phase structures. The obtained theoretical and numerical results provide valuable insights into the behavior of these waves and offer a foundation for further investigations in this field. However, understanding of the topic can be enhanced through a combination of theoretical models, numerical simulations and observational data.

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Section: Plasma Response Function With Finite Oammentioning

confidence: 99%

Low frequency twisted waves in a self-gravitating nonextensive complex plasma

Bukhari

Shahid

et al. 2023

New J. Phys.

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“…for the derivation of equation (11). Here, Debye length and Jeans length are respectively, defined as and ( ) x q Z j are the axial and helical plasma dispersion functions [38]. The plasma dispersion functions ( )…”

Section: Twisted Dust-acoustic Waves (Tdaws) With Finite Orbital Angu...mentioning

confidence: 99%

Twisted dust-acoustic waves in a self-gravitating dusty plasma with nonextensive q-distributed electrons and ions

2023

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We have investigated the twisted dust-acoustic waves (TDAWs) in an electrostatic self-gravitating dusty plasma whose electrons and ions are modelled by nonextensive q-distribution function while massive dust particles are Maxwellian distributed. A well-known kinetic theory is employed for this purpose where perturbed distribution function, electrostatic and gravitational potentials are expressed with Laguerre-Gauss functions. The governing equations of kinetic theory are solved together under paraxial approximations. The dispersion relations and instability growth rates are obtained for two situations; a) super-extensivity (q<1) and b) sub-extensivity (q>1). Significant modifications concerning the wave frequencies and growth rates are presented with respect to self-gravitation parameter, twist parameter, nonextensive parameter and streaming speed. It is observed that wave frequency and growth rate of TDAWs reduces in the presence of self-gravitating effects. Furthermore, the growth rates exhibit a significant enhancement in amplitude with the increase in twist parameter, q-parameter and streaming speed. Our present results may have applications in interstellar dust clouds and in the dusty plasma environments of Halley's Comet.

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