The nonlinear ion acoustic wave propagating obliquely with respect to an external magnetic field is studied in a homogeneous magnetized electron-positron-ion plasma. It found that the amplitude of solitary structure increases percentage presence positrons, which opposite behaviour previous study these waves unmagnetized speed soliton plasma turns out be subsonic, while it supersonic case already studied.

Ion-acoustic envelope solitons in a collisionless unmagnetized electron-positron-ion plasma are studied. The Krylov-Bogoliubov-Mitropolsky perturbative technique is used to obtain the nonlinear Schrödinger equation. critical wave number for modulational instability depends upon concentration of different species and temperature ratios electrons positrons. In limiting case zero positron we recover previous results electron-ion plasma. It found that small ions electron-positron plasmas can...

Nonlinear structures formed by the coupled drift wave (DW) and ion acoustic waves (IAWs) are studied in a magnetized inhomogeneous collisionless bi-ion plasma with ions shear flow along ambient magnetic field B=B0ẑ. The electrons assumed to follow double spectral index (r, q) distribution which r shows flat top nature, while q is responsible for shape of at tail. A nonlinear differential equation derived, its solutions form layers (DLs) solitons obtained different limits. It pointed out...

It is shown that the reductive perturbation method can be applied to derive Korteweg–de Vries equation for obliquely propagating small amplitude ion acoustic waves in magnetized (B0 ≠ 0) plasma.

A criterion is presented to decide whether a produced plasma can be called pure pair-ion or not. The theory discussed in the light of recent experiments which claim that fullerene (C60±) has been produced. It also shown ion acoustic wave replaced by pair convective cell (PPCC) mode as electron density becomes vanishingly small magnetized comprised positive and negative ions. nonlinear dynamics plasmas described two coupled equations have no analog electron-ion plasmas. In stationary frame,...

The nonlinear wave modulation of planar and nonplanar (cylindrical spherical) ion-acoustic envelope solitons in a collisionless unmagnetized electron-positron-ion plasma with two-electron temperature distributions has been studied. reductive perturbative technique is used to obtain modified Schr\"odinger equation, which includes damping term that accounts for the geometrical effect. critical number threshold ${K}_{c}$, indicates where modulational instability sets in, determined various...

A general nonlinear equation for drift waves has been derived using reductive perturbation method (RPM) which admits the solutions in forms of Korteweg de-Vries (KdV) soliton and dipolar vortex different limits. It found that contribution electrons density term also appears Hasegawa-Mima [A. Hasegawa K. Mima, The Physics Fluids 21, 87 (1978)] if it is stretched coordinates by employing RPM. reduces to KdV [H. Saleem, Plasmas 31, 112102 (2024)] electrostatic potential assumed be function only...

The low frequency electrostatic perturbations have been investigated in a bi-ion plasma the background of static dust. It is shown that field aligned shear flow both ions produces instabilities and creates nonlinear structures, double layers, solitons. general theoretical model applied to magnetospheres Jupiter (with positively charged dust) Saturn negatively dust), which oxygen addition protons. This predicts existence extremely waves with real frequencies order millihertz (mHz) several...

Two-stream instabilities in an unmagnetized multi-species dusty plasma are investigated. Four different models considered. The effect of the dust particles on instability growth rate and threshold drift velocity for excitation examined.

It is suggested that low-frequency drift waves can play an important role in the dynamics of electron-positron plasmas comprising some concentration ions. In electromagnetic case wave couples with shear Alfvén electron-positron-ion plasma. The frequency be very low such depending on and density scale lengths plasma components. nonlinear regime these give rise to dipolar vortices both electrostatic limits. velocity structure turns out different compared electron-ion

A theoretical analysis of the ion acoustic wave in pair-ion plasmas is presented using a kinetic model. It shown that small concentration electrons can break down quasineutrality perturbed systems because electron Debye length become very large. In limit 1⪡λDe2k2 (where λDe length), damping reduced and hence be easily excited. The real frequency larger than plasma oscillation this case. But decreasing number density increase Landau significantly λDe2k2⪡1. results are discussed comparison...

The nonlinear amplitude modulation of low-frequency electrostatic ion waves propagating in collisionless magnetized electron-positron-ion plasma are studied. Krylov–Bogoliubov–Mitropolsky perturbation method is employed to derive the Schrödinger equation. Modulation instability both ion-acoustic and ion-cyclotronlike modes examined. We found that mode, which propagates below ion-cyclotron frequency, stable if strength external magnetic field small. However, as increases, this mode becomes...

We present the results from ab initio, self-consistent, local density approximation (LDA) calculations of electronic and related properties zinc-blende zinc sulphide (zb-ZnS). employed Ceperley Alder LDA potential linear combination atomic orbital (LCAO) formalism. Our are non-relativistic. The implementation LCAO formalism followed Bagayoko, Zhao, Williams (BZW) method, as enhanced by Ekuma Franklin (BZW-EF). BZW-EF method includes a methodical search for optimal basis set that yields...

Nonlinear kinetic Alfvén waves are studied in an electron-positron-ion plasma. It is noticed that the nonlinearity and Larmor radius effects can compromise to give rise density dips such plasmas super Alfvénic regime. A comparison presented with previous results, which predict humps if ion inertial parallel external magnetic field taken into account.

The classic shear flow instability is discussed and, in particular, the effect of cancellation contribution diamagnetic drift convective derivative polarization against relevant collisionless stress tensor part. This shows that a nonuniform plasma basically wave instability. If ions are considered to be hot, criterion modified even homogeneous limit due ion tensor. A comparison our results with existing literature on this topic presented. criteria also investigated for electron-positron-ion...

A nonlinear equation for ion acoustic waves in dense quantum plasmas (which is analogous to the classical plasma case) has been obtained a particular limit. Therefore it proposed that electrostatic monopolar and dipolar vortices can appear uniform due large amplitude fluctuations. It noticed scale length of these structures will be very short. The main effect appears through Fermi pressure.

It is pointed out that interactions between the solar wind and dusty magnetospheres of planets comets give rise to nonlinear electrostatic drift waves. assumed after transient processes a local steady state attained with same sheared flow electrons ions V i 0 ( x ) = e along initial constant component B z total magnetic field . The perturbation caused by electron temperature gradient forms solitary shock structures, depending upon dominant role either wave dispersion or dissipation,...

It is shown that the inhomogeneous field-aligned flow of heavier ions into stationary plasma upper ionosphere produces very low frequency (of order a few Hz) electrostatic unstable ion acoustic waves (IAWs). This instability an oscillatory unlike D'Angelo's purely growing mode. The growth rate wave (IAW) corresponding to due shear and larger than Landau damping. However, non-flowing lighter are damped. found even if condition satisfied, mode develops its real in this coupled system. Hence,...

Two coupled nonlinear equations for a perturbed electromagnetic field in an electron-positron-ion plasma with shear flow, embedded nonuniform magnetic field, are derived and solved analytically. The solutions of these found the form tripolar vortices. linear instability condition is also discussed. It that presence ions can play significant role dynamics, even if density order 10−3 as compared to densities lighter species.

It is found that ion streaming and the direction of propagation nonlinear structure are factors which can determine amplitude density hump in fully ion-acoustic solitary waves.