Effect of streaming velocity, magnetic field, and higher-order correction on the nature of ion acoustic solitons in the Venusian ionosphere
Effect of streaming velocity, magnetic field, and higher-order correction on the nature of ion acoustic solitons in the Venusian ionosphere
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流速度、磁场和高阶校正对金星电离层中离子声孤子性质的影响
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
S. El
中科院分区：
文献类型：
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作者：
A. Fayad;W. Moslem;S. El
研究了弱非线性离子声波在金星电离层等离子体中的传播特性。等离子体模型包括两个正冷离子（氧O +和氢H +），以及等温电子。将基本流体方程组化为Zakharov-Kuznetsov（ZK）方程和线性非齐次ZK型方程（LIZKT）方程。采用重整化方法得到了两个方程的孤立子解。研究了等离子体参数和高阶修正对孤立波性质的影响。发现波相速度为超声速，这与观测结果一致。高阶修正使孤立子振幅增大，适用于描述振幅增大时的孤立波。
Propagation properties of weakly nonlinear ion acoustic waves are investigated in a plasma at the Venusian ionosphere. The plasma model consists of two positive cold ions (oxygen O + and hydrogen H +), as well as isothermal electrons. The basic set of fluid equations is reduced to Zakharov-Kuznetsov (ZK) equation and linear inhomogeneous ZK-type equation (LIZKT) equation. The renormalization method is adopted to obtain solitary solutions of both equations. The effects of plasma parameters and higher-order correction on the nature of the solitary waves are investigated. It is found that the wave phase velocity is supersonic, which is in agreement with the observations. Furthermore, the higher-order correction enlarges the soliton amplitude, which is suitable for describing the solitary waves when the wave amplitude grows.