Effect of streaming velocity, magnetic field, and higher-order correction on the nature of ion acoustic solitons in the Venusian ionosphere

Abstract

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.

Electrostatic Solitary Waves in the Venusian Ionosphere Pervaded by the Solar Wind: A Theoretical Perspective

“…In addition, the electric field amplitude matches well with that reported by Fayad et al (2021). Streaming ion velocities were reported to enhance the amplitude and energy of the solitons by Fayad et al (2021). In our case, the streaming velocity of the solar wind particles only has a significant affect on the soliton characteristics when their number density is above a threshold value (n sp0 > 0.15).…”

“…Similar characteristics are shown by O + ion-acoustic solitons in both DD and NM sector in our model. In addition, the electric field amplitude matches well with that reported by Fayad et al (2021). Streaming ion velocities were reported to enhance the amplitude and energy of the solitons by Fayad et al (2021).…”

“…In addition, Sayed et al (2020) did not consider the effect of streaming solar wind particles on the Venusian ionosphere. Fayad et al (2021) studied weakly nonlinear ion-acoustic solitons in the Venus ionosphere assumed to be composed of streaming O + and H + ions and Maxwellian electrons using Zakharov-Kuznetsov equation. They reported compressive solitons with an electric field amplitude ∼(7.63-11.52) mV m −1 occurring at an altitude of (400-1000) km in DD meridian of the Venusian atmosphere.…”

Role of solar wind on the ionic escaping from Venus upper ionosphere via plasma wakefield

“…On the other hand, the role of the plasmas in Venus's ionosphere is studied by many authors [17][18][19][20][21]. The basic properties of the propagation of the nonlinear and fully nonlinear IAWs in the Venusian ionosphere are studied by Sayed et al [17].…”

“…Their results show that the presence of the superthermal electrons and the temperature of the relative ionic species diminished the amplitude of solitons, conidals, and periodic waves. Fayad et al [19] proposed a theoretical model to examine the effect of magnetic field strength, ions' streaming velocity and higher order nonlinearity on the properties of the solitary structure in Venus' ionosphere. Also, Fayad et al [20] investigated the effect of the gradients of the number density, the flow velocity and the magnetic field on the basic features of the propagated low-frequency electrostatic waves in the vicinity of Venus' terminator.…”