共查询到20条相似文献,搜索用时 15 毫秒
1.
A.A. Mamun 《Physics letters. A》2008,372(6):884-887
An adiabatic hot dusty plasma (containing non-inertial adiabatic electron and ion fluids, and negatively charged inertial adiabatic dust fluid) is considered. The basic properties of arbitrary amplitude dust-acoustic (DA) solitary waves, which exist in such an adiabatic hot dusty plasma, are explicitly examined by the pseudo-potential approach. To compare the basic properties (critical Mach number, amplitude and width) of the DA solitary waves observed in a dusty plasma containing adiabatic electron, ion and dust fluids with those observed in a dusty plasma containing isothermal electron and ion fluids and adiabatic dust fluid, it has been found that the adiabatic effect of inertia-less electron and ion fluids has significantly modified the basic properties of the DA solitary waves, and that on the basic properties of the DA solitary waves, the adiabatic effect of electron and ion fluids is much more significant than that of the dust fluid. 相似文献
2.
Kamal Kumar Ghosh Depankar Ray S. N. Paul 《International Journal of Theoretical Physics》1992,31(1):75-80
The propagation of fully nonlinear ion-acoustic solitary waves in a magnetized plasma with cold ions and warm electrons is studied analytically. Necessary conditions for the existence of solitary waves in such a plasma were obtained by Yuet al. In this paper necessary and sufficient conditions are found. 相似文献
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An exact solution is obtained for the equations that describe nonlinear ion-acoustic waves in a dusty plasma. It is shown that the solution can be in the form of nonlinear periodic waves, solitons, and supernonlinear waves whose trajectories envelope one or several separatrices in the phase portrait of the wave. Profiles of physical quantities in the wave are constructed. The supernonlinear waves are shown to be of two types, subsonic (type 1) and supersonic (type 2). Existence regions of supernonlinear waves of both types and solitons are constructed in the plane of the problem parameters. 相似文献
5.
The nonlinear propagation of dust ion-acoustic (DIA) shock waves is studied in a charge varying dusty plasma with electrons having kappa velocity distribution. We use hot ions with equilibrium streaming speed and a fast superthermal electron charging current derived from orbit limited motion (OLM) theory. It is found that the presence of superthermal electrons does not only significantly modify the basic properties of shock waves, but also causes the existence of shock profile with only positive potential in such plasma with parameter ranges corresponding to Saturn?s rings. It is also shown that the strength and steepness of the shock waves decrease with increase of the size of dust grains and ion temperature. 相似文献
6.
通过使用推广的 Poincar-Lighthill-Kuo 摄动方法,研究了二维热离子等离子体中两个沿不同方向传播的离子声孤波的相互作用,得到了两个分别描述沿ξ和η方向传播的孤波的KdV方程以及两个孤波以任意夹角碰撞后的相移和轨道.同时还研究了离子温度比σ、热容比γ和碰撞夹角α对孤波相移的影响.研究表明,这些参量可以明显地改变孤波的相移,且在该系统中存在压缩型孤波.
关键词:
热离子等离子体
离子声孤波
Poincar-Lighthill-Kuo方法
相移 相似文献
7.
S. N. Paul K. Roychowdhury S. Burman A. Roychowdhury B. Paul 《Czechoslovak Journal of Physics》2006,56(12):1453-1460
Theoretical investigation on the propagation of ion-acoustic waves in an unmagnetized self-gravitating plasma has been made
for the existence of solitary waves using the reductive perturbation method. It is observed that nonlinear excitations follow
a coupled third-order partial differential equation which is slightly different from the usual case of coupled Korteweg-de
Vries (K-dV) system. It appears that the system so deduced is a two-component generalization of the previous one derived by
Paul et al. (1999) in which it was shown that ion-acoustic solitary waves can not exist in such system. 相似文献
8.
Dust ion-acoustic (DIA) rogue waves are reported for a three-component ultracold quantum dusty plasma comprised of inertialess electrons, inertial ions, and negatively charged immobile dust particles. The nonlinear Schrödinger (NLS) equation appears for the low frequency limit. Modulation instability (MI) of the DIA waves is analyzed. Influence of the modulation wave number, ion-to-electron Fermi temperature ratio ρ and dust-to-ion background density ratio Nd on the MI growth rate is discussed. The first- and second-order DIA rogue-wave solutions of the NLS equation are examined numerically. It is found that the enhancement of Nd and carrier wave number can increase the envelope rogue-wave amplitudes. However, the increase of ρ reduces the envelope rogue-wave amplitudes. 相似文献
9.
Effect of adiabatic variation of dust charges on dust acoustic solitary waves in magnetized dusty plasmas 下载免费PDF全文
The effect of dust charging and the influence of its adiabatic variation on dust acoustic waves is investigated. By employing the reductive perturbation technique we derived a Zakharov-Kuznetsov (ZK) equation for small amplitude dust acoustic waves. We have analytically verified that there are only rarefactive solitary waves for this system. The instability region for one-dimensional solitary wave under transverse perturbations has also been obtained. The obliquely propagating solitary waves to the z-direction for the ZK equation are given in this paper as well. 相似文献
10.
Properties of nonplanar (viz. cylindrical and spherical) dust ion-acoustic (DIA) solitary and shock waves propagating in a dusty plasma containing charge fluctuating stationary dust, inertial warm ions, and non-isothermal electrons following a vortex-like distribution, are investigated by the reductive perturbation method. It has been shown that all the basic features of the DIA solitary and shock waves are significantly modified by the effects of vortex-like electron distribution, dust charge fluctuation, and nonplanar cylindrical and spherical geometries. The implications of our results in some space and laboratory dusty plasma environments are briefly discussed. 相似文献
11.
Effect of dust charge variation on dust—acoustic solitary waves in a magnetized two—ion—temperature dusty plasma 下载免费PDF全文
The effect of dust charge variation on the dust-acoustic solitary structures is investigated in a warm magnetized two-ion-temperature dusty plasma consisting of a negatively and variably charged extremely massive dust fluid and ions of two different temperatures. It is shown that the dust charge variation as well as the presence of a second component of ions would modify the properties of the dust-acoustic solitary structures and may exite both dust-acoustic solitary holes (soliton waves with a density dip) and positive solitons (soliton waves with a density hump). 相似文献
12.
K. K. Mondal 《Pramana》2007,69(2):241-253
For an unmagnetised collisionless plasma consisting of warm ions, nonisothermal electrons and cold, massive and charged dust
grains, the Sagdeev potential equation, considering both ion dynamics and dust dynamics has been derived. It has been observed
that the Sagdeev potential V(ϕ) exists only for ϕ > 0 up to an upper limit (ϕ ≃ 1.2). This implies the possibility of existence of compressive solitary wave in the plasma. Exhaustive numerics done for
both the large-amplitude and small-amplitude ion-acoustic waves have revealed that various parameters, namely, ion temperature,
non-isothermality of electrons, Mach numbers etc. have considerable impact on the amplitude as well as the width of the solitary
waves. Dependence of soliton profiles on the ion temperature and the Mach number has also been graphically displayed. Moreover,
incorporating dust-charge fluctuation and non-isothermality of electrons, a non-linear equation relating the grain surface
potential to the electrostatic potential has been derived. It has been solved numerically and interdependence of the two potentials
for various ion temperatures and orders of non-isothermality has been shown graphically.
相似文献
13.
A. V. Filippov A. N. Starostin I. M. Tkachenko V. E. Fortov D. Ballester L. Conde 《JETP Letters》2010,91(11):558-565
With the use of the method of moments applicable for any values of the parameter of the nonideality of a dusty plasma and
the hydrodynamic approach applicable only for small nonideality parameters, the theory of waves and oscillations of a complex
plasma has been generalized to the case of a two-exponential interaction potential. It has been shown that the hydrodynamic
approach and method of moments give the same dispersion relation for small nonideality parameters. It has been demonstrated
that the velocity of dust acoustic waves in the long- and short-wavelength regions is determined by the small and large screening
constants, respectively. It has been shown that the velocity of dust acoustic waves in nonequilibrium plasma is much higher
than that obtained in the Debye screening theory for equilibrium plasma. In the hydrodynamic approach, the importance of the
inclusion of the self-consistent mutual effect of the dust, electron, and ion components, and sinks of electrons and ions
on dust particles, which lead to a noticeable change in the parameters of the interaction potential of dust particles, has
been demonstrated. 相似文献
14.
We study some nonlinear waves in a viscous plasma which is confined in a finite cylinder.By averaging the physical quantities on the radial direction in some cases,we reduce this system to a simple one-dimensional model.It seems that the effects of the bounded geometry(the radius of the cylinder in this case)can be included in the damping coefficient.We notice that the amplitudes of both Korteweg–de Vries(KdV)solitary waves and dark envelope solitary waves decrease exponentially as time increases from the particle-in-cell(PIC)simulation.The dependence of damping coefficient on the cylinder radius and the viscosity coefficient is also obtained numerically and analytically.Both are in good agreement.By using a definition,we give a condition whether a solitary wave exists in a bounded plasma.Moreover,some of potential applications in laboratory experiments are suggested. 相似文献
15.
T. Abbaszadeh H. Zahed S. Salkhi Khasraghi M.S. Sekhavat 《Current Applied Physics》2013,13(9):1933-1942
Dust ion-acoustic waves propagation in the magnetized dusty plasma including ions, electrons and dust particulates are studied by using kinetic equation. For unbounded and collisionless plasma and in the presence of uniform external magnetic field B0, electrons and ions with Lorentzian distribution function and dust particles with Maxwellian one are considered. Calculating dielectric tensor through the Vlasov equation solution, in the parallel propagation, dispersion relation is derived and suprathermal particle effects on the Landau damping is studied. It is shown that the Landau damping effect vanishes for parallel propagation. 相似文献
16.
BISWAJIT SAHU 《Pramana》2011,76(6):933-944
Small amplitude quantum ion-acoustic solitary waves are studied in an unmagnetized two- species relativistic quantum plasma
system, comprised of electrons and ions. The one-dimensional quantum hydrodynamic model (QHD) is used to obtain a deformed
Korteweg–de Vries (dKdV) equation by reductive perturbation method. A linear dispersion relation is also obtained taking into
account the relativistic effect. The properties of quantum ion-acoustic solitary waves, obtained from the deformed KdV equation,
are studied taking into account the quantum mechanical effects in the weak relativistic limit. It is found that relativistic
effects significantly modify the properties of quantum ion-acoustic waves. Also the effect of the quantum parameter H on the nature of solitary wave solutions is studied in some detail. 相似文献
17.
Nonlinear adiabatic models of ion-acoustic waves in a dust plasma are developed. The problem of the structure of subsonic
periodic and supersonic solitary ion-acoustic waves is exactly solved analytically under the assumption of a constant charge
of dust particles; the critical Mach numbers for the solitary wave are determined. The problem of the wave structure is solved
numerically for the case when the charge of dust particles was assumed to be variable. 相似文献
18.
S. Mahmood N. Akhtar 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2008,49(2):217-222
Linear and nonlinear ion acoustic waves in the presence of adiabatically heated ions in magnetized electron-positron-ion plasmas
are studied. The Sagdeev potential approach is employed to obtain the energy integral equation in such a mulitcomponent plasma
using fluid theory. It is found that electron density humps are formed in the subsonic region in magnetized electron-positron-ion
plasmas. The amplitude of electron density hump is decreased with the increase of hot ion temperature in electron-positron-ion
plasmas. However, the increase in positron concentration and obliqueness of the wave increases the amplitude of nonlinear
structure. The increase in positron concentration also reduces the width of the nonlinear structure in a magnetized multicomponent
plasma. The numerical solutions in the form of solitary pulses are also presented for different plasma cases. The results
may be applicable to astrophysical plasma situations, where magnetized electron-positron-ion plasma with hot ions can exist. 相似文献
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20.
The characteristics of the head-on collision between two-quantum ion-acoustic solitary waves (QIASWs) in a dense electron-positron-ion plasma are investigated. Using the extended Poincaré-Lighthill-Kuo (PLK) method, the Korteweg-de Vries (KdV) equations and the analytical phase shifts, after two QIASWs collision occurs, are derived. This study is a first attempt to illustrate the effects of both of the quantum diffraction corrections and the Fermi temperature ratio of positrons to electrons on the phase shifts. It is found that the electron-positron-ion plasma parameters modify significantly the phase shifts of the two colliding solitary waves. 相似文献