Journal
ADVANCES IN SPACE RESEARCH
Volume 67, Issue 3, Pages 1039-1048Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.asr.2020.10.046
Keywords
Electrostatic plasma waves; Forced Korteweg-de Vries equation; Nonlinear structures
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The study focuses on the nonlinear ion-acoustic wave (IAW) excitations in an electron-pair-ion quantum plasma induced by a moving charged object, deriving a forced Korteweg-de Vries (fKdV) type equation and investigating the impact of plasma parameters on solitonic excitations. Numerical simulations show significant effects of quantum parameters on the propagation characteristics of nonlinear excitations.
Within a quantum hydrodynamic model and using the reductive perturbation technique, the nonlinear ion-acoustic wave (IAW) excitations due to a moving charged object in an electron-pair-ion quantum plasma are studied both analytically and numerically. In such quantum plasmas we have derived forced Korteweg-de Vries (fKdV) type equation for finite amplitude nonlinear IAWs. The effect of relevant plasma parameters on solitonic excitations is investigated. Numerical simulation shows the generation of advancing solitons ahead of the forcing term traveling at a faster rate with trailing wakes behind the forcing disturbance. It is found that propagation characteristics of nonlinear excitations are significantly affected by quantum parameter. Additionally, we have pursued our analysis by extending it to account for arbitrary amplitude IA solitons, and derived a system of nonlinear differential equations which are analyzed numerically to study the dynamics. Nonlinear analysis predicts the existence of periodic and quasiperiodic nature of the nonlinear system and reveals that the transition from quasiperiodic to periodic behavior occurs due to the variation of quantum diffraction. (C) 2020 COSPAR. Published by Elsevier Ltd. All rights reserved.
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