Formation of Large Amplitude Solitons and Small Amplitude Double Layers in Two-temperature Non-isothermal Electron Plasma

Propagation of large amplitude ion-acoustic solitary waves and small amplitude double layers have been investigated in a two-temperature non-isothermal electron plasma consisting of warm positive ions, warm negative ions and warm positrons by Sagdeev pseudopotential method (SPM). Small amplitude double layer solution (<i>ϕ<SUB>DL</SUB></i>) is also discussed theoretically in this paper for further investigation. Fully non-linear large amplitude compressive solitary waves and small amplitude compressive double layers are presented graphically by the corresponding figurs 1 – 14 under the variation of different values of the mass ratios (Q) of negative to positive ions, phase velocities (V) of solitary waves, negative ion concentrations (n<sub>jo</sub>), positron densities (χ) and temperature ratios (<i>σ<sub>p</sub></i>) of electrons (<i>T<sub>e</sub></i>) and positrons (<i>T<sub>p</sub></i>). Consequently this large amplitude electrostatic solitary waves and small amplitude electrostatic double layers in complex plasmas have broad applications in space plasma Physics, Astrophysics, Fusion technology, Plasma – based devices and Fundamental wave research, offering tools for exploring wave-particle interactions, stability and energy transfer in multi-species plasmas.