Hatami M M
Physics Department, K. N. Toosi University of Technology, Tehran, 15418-49611, Iran.
Sci Rep. 2023 Sep 29;13(1):16363. doi: 10.1038/s41598-023-43422-1.
Formation and the basic features of arbitrary amplitude ion-acoustic solitary waves (IASWs) in a plasma consisting of warm positive ions, two [Formula: see text]-distributed electrons and an electron beam are investigated by using the Sagdeev pseudopotential approach. It is shown that the soliton existence domain (Mach number limits) sensitively depends on temperature of ions, spectral index of cool electrons and concentration of hot electron species while spectral index of hot electrons, hot-to-cool electron temperature ratio and also concentration of electron beam do not considerably affect this domain. It is also found that temperature of electron beam only affect the existence domain of rarefactive solitons. Furthermore, it is shown that considered plasma medium supports the coexistence of positive and negative IASWs. Moreover, effect of different plasma parameters such as hot-to-cool electron density ratio, ion-to-cool electron temperature ratio, beam-to-ion density ratio, hot-to-cool electron temperature ratio and superthermality index of electron species on the basic features of positive and negative IASWs is investigated numerically. Finally, the effect of plasma parameters on the parametric regime of coexistence of compressive and rarefactive IASWs is studied and, for example, effect of temperature of positive ions and number density of hot electrons on polarity of IASWs is numerically investigated.
利用萨格德耶夫赝势方法研究了由热正离子、两种呈[公式：见原文]分布的电子以及一束电子组成的等离子体中任意振幅离子声孤立波（IASWs）的形成及其基本特性。结果表明，孤子存在域（马赫数极限）敏感地依赖于离子温度、冷电子的谱指数以及热电子种类的浓度，而热电子的谱指数、热电子与冷电子的温度比以及电子束的浓度对该域没有显著影响。还发现电子束温度仅影响稀疏孤子的存在域。此外，结果表明所考虑的等离子体介质支持正、负IASWs的共存。此外，数值研究了不同等离子体参数，如热电子与冷电子密度比、离子与冷电子温度比、束流与离子密度比、热电子与冷电子温度比以及电子种类的超热指数对正、负IASWs基本特性的影响。最后，研究了等离子体参数对压缩和稀疏IASWs共存参数范围的影响，例如，数值研究了正离子温度和热电子数密度对IASWs极性的影响。
