Electron acoustic solitons in magneto-rotating electron-positron-ion plasma with nonthermal electrons and positrons

Jilani, K.; Mirza, Arshad M.; Iqbal, Javed

doi:10.1007/s10509-014-2167-5

Cited by 9 publications

(5 citation statements)

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“…Studies of e-p pair plasmas demonstrated that electrostatic solitary waves can be generated [40], though a Maxwellian distribution was assumed. A number of papers have also been devoted to the linear and nonlinear dynamics of electronacoustic waves [46,47], electrostatic waves [48][49][50][51][52][53][54][55], and in the presence of suprathermal (and non-thermal) electrons [46,50,52] in e-p pair plasmas. Moreover, the propagation of ion-acoustic waves [56][57][58][59], and dust-acoustic waves [60][61][62] have recently been studied in e-p plasmas.…”

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confidence: 99%

Electrostatic solitary waves in an electron-positron pair plasma with suprathermal electrons

Danehkar

2017

Physics of Plasmas

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The nonlinear propagation of electrostatic solitary waves is studied in a collisionless electronpositron pair plasma consisting of adiabatic cool electrons, mobile cool positrons (or electron holes), hot suprathermal electrons described by a κ distribution, and stationary ions. The linear dispersion relation derived for electrostatic waves demonstrates a weak dependence of the phase speed on physical conditions of positrons in appropriate ranges of parameters. The Sagdeev's pseudopotential approach is used to obtain the existence of electrostatic solitary wave structures, focusing on how their characteristics depend on the physical conditions of positrons and suprathermal electrons. Both negative and positive polarity electrostatic solitary waves are found to exist in different ranges of Mach numbers. As the positrons constitute a small fraction of the total number density, they slightly affect the existence domains. However, the positrons can significantly change the wave potential at a fixed soliton speed. The results indicate that the positive potential can greatly be grown by increasing the electron suprathermality (lower κ) at a fixed true Mach number. It is found that a fraction of positrons maintain the generation of positive polarity electrostatic solitary waves in the presence of suprathermal electrons in pair plasmas.

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confidence: 99%

Electrostatic solitary waves in an electron-positron pair plasma with suprathermal electrons

Danehkar

2017

Physics of Plasmas

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“…In this section, we investigate the dependence of the electron acoustic both monotonic as well as oscillatory shocks in a magnetized dissipative e‐p‐i plasma on relevant plasma parameters such as Coriolis force, magnetic field, obliqueness θ , positron to hot electron temperature ratio γ , cold electron to hot electron temperature ratio σ ⊥ and σ ‖ , kinematic viscosity η c ‖ o and η c ⊥ o , and superthermal distribution parameters κ e and κ p , along with other normalized physical parameters of interest including α and σ . We have selected the appropriate range n oc ∼ (0.1–0.4) cm −3 , n op ∼ (1.5–3) cm −3 , n oh ∼ (1.5–3) cm −3 , T h ∼ (200–1,000) eV, T p ∼ (200–1,000) eV to satisfy various plasma systems from laboratory level to astrophysical/space plasmas (Jilani et al, ). The nonlinear, dissipation, and dispersion coefficients are strongly dependent on the various plasma parameters, due to which change in any of the parameter causes a significant change in the given coefficients, which further modify the characteristics of EA shock waves.…”

Section: Resultsmentioning

confidence: 99%

“…The plasma is rotating with frequency

\overset{Ω}{true}

about the axis of rotation which makes an angle θ with the magnetic field direction, that is,

\overset{Ω}{true} = Ω_{0} \sin θ + Ω_{0} \cos θ

, where Ω 0 is the magnitude of rotational plasma frequency. The dynamics of EASWs are characterized by the following set of normalized fluid equations (continuity, momentum, and Poisson) ( Jilani et al, ):

\frac{\partial n_{c}}{\partial t} + \frac{\partial ((), n_{c} u_{c x})}{\partial x} + \frac{\partial ((), n_{c} u_{c z})}{\partial z} = 0

\frac{\partial u_{c x}}{\partial t} + u_{c x} \frac{\partial u_{c x}}{\partial x} + u_{c z} \frac{\partial u_{c x}}{\partial z} = \frac{\partial ϕ}{\partial x} - normalΩ u_{c y} + 2 Ω_{0} \cos θ u_{c y} - \frac{σ_{⊥}}{n_{c}} \frac{\partial n_{c}}{\partial x} + η_{c ⊥} \nabla^{2} u_{c x}

\frac{\partial u_{c y}}{\partial t} + u_{c x} \frac{\partial u_{c y}}{\partial x} + u_{c z} \frac{\partial u_{c y}}{\partial z} = normalΩ u_{c x} + 2 Ω_{0} \sin θ u_{c z} - 2 Ω_{0} \cos θ u_{c x} + η_{c ⊥} \nabla

…”

Section: Fluid Modelmentioning

confidence: 99%

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Effect of Anisotropic Pressure on Electron Acoustic Oscillatory and Monotonic Shocks in Superthermal Magnetoplasma

Singh

Saini

2019

Radio Science

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Nonlinear oscillatory and monotonic electron acoustic shock waves in dissipative magnetorotating electron-positron-ion plasmas containing cold dynamical electrons, superthermal electrons, and positrons have been analyzed in the stationary background of massive positive ions. The Korteweg de-Vries-Burgers equation which describes the dynamics of the nonlinear shock structures is derived by using amplitude reductive perturbation technique. The quantitative analysis of impact of different physical parameters on the shock structures is presented here. The electron fluid viscosity plays a pivotal role for the transition of electron acoustic (EA) monotonic to oscillatory shocks and vice versa. It is remarkable that the shock structures are sensitive to the Coriolis force, obliqueness, electron temperature, and the positrons concentration. The present work may be employed to explore and to understand the formation of electron acoustic shock structures in the space and laboratory plasmas with superthermal electrons and positrons under magnetorotating effects, especially in auroral zone, Van Allen radiation belts, planetary magnetospheres, pulsars, black-hole magnetospheres, etc.

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“…24 Many authors have studied the soliton solutions of Korteweg-de Vries (KdV) type equations in plasma by deriving them using different reductive perturbation techniques and they solved them using different methods, such as numerical methods, analytic solution, etc. 22,[25][26][27][28][29][30][31] These works revealed the physical properties of the plasmas considering only one solution of the KdV equation under some approximations. In this paper, we have analytically solved the KdV type equation given by Mehdipoor and Neirameh, 30 Kalita and Deka 31 using the two different expansion methods, ðG 0 =GÞ and ðG 0 =G; 1=GÞ without any approximation.…”

mentioning

confidence: 98%

Investigating the effect of integration constants and various plasma parameters on the dynamics of the soliton in different physical plasmas

Dağhan

Dönmez

2015

Physics of Plasmas

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The nonlinear dynamics and propagation of ion acoustic waves in a relativistic and ideal plasmas, which have the pressure variation of electrons and ions and degenerate electrons, are investigated using the analytic solution of KdV type equations performed applying (G′/G)-expansion and (G′/G,1/G)-expansion methods. The effects of various parameters, such as phase velocity of the ion acoustic wave, the ratio of ion temperature to electron temperature, normalized speed of light, electron and ion streaming velocities, arbitrary and integration constants, on the soliton dynamics are studied. We have found that dim and hump solitons and their amplitudes, widths and dynamics strongly depend on these plasma parameters and integration constants. The source term μ plays also a vital role in the formation of the solitons. Moreover, it is also found that the observed solitary wave solution can be excited from hump soliton to dip soliton. This dramatic change of the solitons can occur due to the various values of the integration constants and ion streaming velocities. Finally, it is important to note that the analytic solutions of the nonlinear equation, reported in this study, could be used to explain the structures of solitons in the astrophysical space and in laboratory plasmas.

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Electron acoustic solitons in magneto-rotating electron-positron-ion plasma with nonthermal electrons and positrons

Cited by 9 publications

References 57 publications

Electrostatic solitary waves in an electron-positron pair plasma with suprathermal electrons

Electrostatic solitary waves in an electron-positron pair plasma with suprathermal electrons

Effect of Anisotropic Pressure on Electron Acoustic Oscillatory and Monotonic Shocks in Superthermal Magnetoplasma

Investigating the effect of integration constants and various plasma parameters on the dynamics of the soliton in different physical plasmas

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