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Description
This study investigates the formation of non-linear ion-acoustic solitary structures (IASSs) in magnetized plasmas consisting of inertial cold ions, superthermal electrons, and positrons. The reductive perturbation method was employed to derive the Korteweg-de Vries (KdV) equation, and the steady state solution of the KdV equation was obtained, providing a framework for exploring the solitary structures based on empirically observed ranges in space and astrophysical plasmas for various parameter such as superthermal electrons, (κe = 2, 4, 50), unperturbed positron to electron density ratio (p = np0/ne0), ion-to-electron temperature ratio (δ = Ti/Te ), electron-to-positron temperature ratio, (σ = Tp/Te ) and oblique propagation angles (θ = 0, π/10, π/4). From the expression KdV equation, the coefficient P represents the nonlinear effects, whereas Q describes the dispersive properties of the medium, together governing the formation and characteristics of solitary wave
structures in the plasma. The derived solitary wave (soliton) profile, whose functional form follows the square of the hyperbolic secant (sech2-type), reveals how these parameters modulate the amplitude, width, and polarity of electrostatic solitary waves. The numerical results show that the solution of the non-linear equation allows only compressive (positive) soliton structures to exist. The results further demonstrate that soliton properties are susceptible to plasma parameters; increasing superthermality or positron concentration leads to reduced amplitude and broadened profiles, temperature ratios (σ, δ), and obliqueness angle (θ) also significantly modulate the nonlinear and dispersive behavior of the solitary waves. Our study of IASSs provides critical information on theoretical understanding and practical technologies across various plasma applications in laboratory and astrophysical settings.
| Stream | Science or Engineering |
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