scholarly journals Пылевые звуковые солитоны в запыленной ионосферной плазме, содержащей адиабатически захваченные электроны

2019 ◽  
Vol 45 (20) ◽  
pp. 26
Author(s):  
С.И. Копнин ◽  
С.И. Попель
Keyword(s):  
Soliton Solutions ◽  
Dust Particles ◽  
Charged Dust ◽  
Electrons And Ions ◽  
Dust Acoustic

A possibility of propagation of localized wave structures, such as dust acoustic solitons, in dusty ionospheric plasmas, which contain photoelectrons, electrons and ions, as well as charged dust particles, is considered. The regions of possible velocities and amplitudes of solitons are determined. Soliton solutions are found for various sizes and number densities of dust particles in the dusty ionospheric plasmas.

scholarly journals Пылевые звуковые солитоны в плазме запыленной экзосферы Луны

2021 ◽  
Vol 47 (9) ◽  
pp. 29
Author(s):  
С.И. Копнин ◽  
С.И. Попель
Keyword(s):  
Solar Wind ◽  
Lunar Surface ◽  
Soliton Solutions ◽  
Dust Particles ◽  
Charged Dust ◽  
The Moon ◽  
Electrons And Ions ◽  
Dust Acoustic

This paper shows a possibility of the existence and propagation of dust acoustic solitons in plasmas of dusty exosphere of the Moon, which contains, in addition to electrons and ions of the solar wind and photoelectrons from the lunar surface, also charged dust particles, as well as photoelectrons emitted from the surfaces of these particles. Soliton solutions are found and the ranges of possible velocities and amplitudes of such solitons are determined depending on the height above the lunar surface for different subsolar angles.

Arbitrary amplitude dust-acoustic solitons in a weakly non-ideal plasma with non-thermal ions

2007 ◽  
Vol 73 (5) ◽  
pp. 671-686 ◽  
Author(s):  
S. K. MAHARAJ ◽  
R. BHARUTHRAM ◽  
S. R. PILLAY
Keyword(s):  
Soliton Solutions ◽  
Thermal Parameter ◽  
Nonlinear Propagation ◽  
Charged Dust ◽  
Dust Acoustic Wave ◽  
Dust Acoustic ◽  
Arbitrary Amplitude ◽  
Dust Fluid ◽  
Lower Limits ◽  
Ideal Plasma

AbstractThe nonlinear propagation of the dust-acoustic wave is investigated in a weakly non-ideal plasma comprising Boltzmann electrons, non-thermal ions characterized by a non-thermal parameter α and a negatively charged dust fluid. The non-ideal dust fluid is represented by the van der Waals equation of state. Arbitrary amplitude soliton solutions are found to occur for both supersonic and subsonic values of the Mach number. Upper and lower limits of the range of values of α for which solitons exist are examined as a function of the non-ideal parameters associated with the effects of volume reduction and the cohesive forces, for both the supersonic and subsonic cases.

Dust acoustic and drift waves in a non-Maxwellian dusty plasma with dust charge fluctuation

2015 ◽  
Vol 81 (6) ◽  
Author(s):  
U. Zakir ◽  
Q. Haque ◽  
N. Imtiaz ◽  
A. Qamar
Keyword(s):  
Dusty Plasma ◽  
Dust Particles ◽  
Drift Waves ◽  
Physical Parameters ◽  
Charge Fluctuation ◽  
Plasma Parameters ◽  
Dust Charge ◽  
Electrons And Ions ◽  
Dust Acoustic ◽  
Dust Charge Fluctuation

The properties of dust acoustic and drift waves are investigated in a charge varying magnetized dusty plasma. The plasma is composed of non-thermal electrons and ions with dynamic dust particles. The mathematical expression which describes the dust charge fluctuation is obtained using ${\it\kappa}$-distribution for both the electrons and ions. A dispersion relation is derived and analysed numerically by choosing space plasma parameters. It is found that the inclusion of variable dust charge along with the non-thermal effects of electrons and ions significantly affect linear/nonlinear properties of the dust acoustic and dust drift waves. The effects of different physical parameters including spectral index (${\it\kappa}$), dust charge number ($Z_{d}$), electron density ($n_{e}$) and ion temperature ($T_{i}$) on the wave dispersion and instability are presented. It is found that the presence of the non-thermal electron and ion populations reduce the growth rate of the instability which arises due to the dust charging effect. In addition, the nonlinear vortex solutions are also obtained. For illustration, the results are analysed by using the dusty plasma parameters of Saturn’s magnetosphere.

Dust acoustic solitary structures in multidust fluids superthermal plasma

2013 ◽  
Vol 91 (7) ◽  
pp. 582-587 ◽  
Author(s):  
Amandeep Singh Bains ◽  
Nareshpal Singh Saini ◽  
Tarsem Singh Gill
Keyword(s):  
Solitary Waves ◽  
Energy Balance Equation ◽  
Dust Particles ◽  
Physical Parameters ◽  
Charged Dust ◽  
Solitary Structures ◽  
Dust Acoustic ◽  
Density Concentration ◽  
Pseudopotential Approach ◽  
Superthermal Plasma

An investigation has been made to study the properties of large-amplitude electrostatic solitary waves in dusty plasma containing both negatively and positively charged dust fluids in the presence of superthermal electrons and ions. The energy balance equation is derived by using the Sagdeev pseudopotential approach. The influence of the physical parameters (e.g., superthermality of electrons or ions, density concentration of positive and negative dust particles, solitary speed) on the amplitude of dust acoustic solitary waves has been discussed in detail. It is observed that there exists a critical value of density, below which negative potential solitary structures exist and above which positive potential solitary structures exist.

Propagation of dust-acoustic nonlinear waves in a homogeneous collisional dusty plasma

2021 ◽  
Author(s):  
Badriah Alotaibi
Keyword(s):  
Dusty Plasma ◽  
Nonlinear Waves ◽  
Acoustic Waves ◽  
Stationary Solutions ◽  
Nonlinear Propagation ◽  
Dust Particles ◽  
Plasma Parameters ◽  
Basic Set ◽  
Electrons And Ions ◽  
Dust Acoustic

Abstract Nonlinear propagation of dust-acoustic waves DAWs in a weakly collisional dusty plasma comprising warm adiabatic fluid dust particles, isothermal electrons, and ions is investigated. We used the reductive perturbation theory to reduce the basic set of fluid equations to one evolution equation, namely damped Kadomtsev--Petviashivili (DKP). The analytical stationary solutions of the DKP equation are numerically analyzed, and the effect of various dusty plasma parameters on DAWs wave propagation is taken into account. We obtained, blast, anti-kink, periodic cnoidal and cnoidal waves. It is well known that explosive waves are a double edged sword. They can be seen, for example, in the atmosphere, or in engineering applications in metal coating. _______________________________________________

On the possibility of dust acoustic waves over sunlit lunar surface

2021 ◽  
Vol 503 (3) ◽  
pp. 3965-3974 ◽  
Author(s):  
S K Mishra
Keyword(s):  
Acoustic Waves ◽  
Phase Speed ◽  
Wave Dispersion ◽  
Dust Particles ◽  
Charged Dust ◽  
Charge Fluctuation ◽  
Dynamical Equations ◽  
Ultralow Frequency ◽  
Dust Charge ◽  
Dust Acoustic

ABSTRACT The photoelectron sheath and floating fine positively charged dust particles constitute two-component dusty plasma in the sunlit lunar regolith’s vicinity. By including the charge fluctuation into photoelectron–dust dynamics, the lunar exospheric plasma is proposed to support the propagation of long-wavelength dust acoustic (DA) modes. Using the standard approach based on the dynamical equations for continuity, momentum, plasma potential, and dust charging along with Fowler's treatment of photoemission and non-Maxwellian nature of the sheath photoelectrons, the wave dispersion is derived. The dust charge variation modifies the usual DA wave dispersion and excites the ultralow frequency modes that propagate with sufficiently low phase speed. Such ultralow frequency modes are predicted as pronounced for smaller values of dust charge and sheath potential. The DA wave dispersion is also depicted as sensitive to the photoelectrons’ energy distribution within the sheath. The quantitative estimates suggest that the nominal exospheric plasma may exhibit DA waves propagating with frequencies of the order of unity.

Dust acoustic shock waves in arbitrarily charged dusty plasma with low and high temperature non-thermal ions

2015 ◽  
Vol 93 (10) ◽  
pp. 1030-1038 ◽  
Author(s):  
Apul N. Dev ◽  
Jnanjyoti Sarma ◽  
Manoj K. Deka
Keyword(s):  
Shock Waves ◽  
Dusty Plasma ◽  
Burgers Equation ◽  
Perturbation Technique ◽  
Nonlinear Propagation ◽  
Dust Particles ◽  
Charged Dust ◽  
Plasma Parameters ◽  
Tanh Method ◽  
Dust Acoustic

Using the well-known reductive perturbation technique, the three-dimensional (3D) Burgers equation and modified 3D Burgers equation have been derived for a plasma system comprising of non-thermal ions, Maxwellian electrons, and negatively charged fluctuating dust particles. The salient features of nonlinear propagation of shock waves in such plasmas have been investigated in detail. The different temperature non-thermal ions and Maxwellian electrons are found to play an important role in the shock waves solution. The analytical solution of the 3D Burgers equation and modified 3D Burgers equation ratifying the propagation of dust acoustic shock waves are derived using the well-known tanh method. On increasing the population of non-thermal ions, an enhancement in the amplitude of shock waves is seen for negatively charged dust particles. A striking dependence of amplitude and width of shock waves on the ratio of ion temperatures and densities are also reported. Finally we introduced a new stretching coordinate and perturbation for the nth-order nonlinear 3D Burgers equation and its solution by the use of the tanh method. We found that, due to higher nonlinearity, the amplitude of shock waves decreases while width remains constant for all plasma parameters considered in the present investigation. The features accounted here could be relevant in the case of different space and astrophysical plasmas and laboratory dusty plasma for negatively charged dust fluctuation.

scholarly journals Effect of Size Distribution on the Dust Acoustic Solitary Waves in Dusty Plasma with Two Kinds of Nonthermal Ions

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Samira Sharif Moghadam ◽  
Davoud Dorranian
Keyword(s):  
Dusty Plasma ◽  
Solitary Waves ◽  
Perturbation Methods ◽  
Relative Size ◽  
Dust Particles ◽  
Charged Dust ◽  
Kp Equation ◽  
Dust Acoustic Solitary Waves ◽  
Dust Acoustic ◽  
Frequency Changes

Effect of dust size, mass, and charge distributions on the nonlinear dust acoustic solitary waves (DASWs) in a dusty plasma including negatively charged dust particles, electrons, and nonthermal ions has been studied analytically. Dust particles masses and electrical charges are assumed to be proportional with dust size. Using reductive perturbation methods the Kadomtsev-Petviashvili (KP) equation is derived and its solitary answers are extracted. The coefficients of nonlinear term of KP equation are affected strongly by the size of dust particles when the relative size (the ratio of the largest dust radius to smallest dust radius) is smaller than 2. These coefficients are very sensitive toα, the nonthermal coefficient. According to the results, only rarefactive DASWs will generate in such dusty plasma. Width of DASW increases with increasing the relative size and nonthermal coefficient, while their amplitude decreases. The dust cyclotron frequency changes with relative size of dust particles.

Antiprobcotron magnetic trap for charged dust particles in space experiments

2019 ◽  
pp. 20-29
Author(s):  
Lev G. D’YACHKOV ◽  
Mikhail M. VASILYEV ◽  
Oleg F. PETROV ◽  
Sergey F. SAVIN ◽  
Igor V. CHURILO
Keyword(s):  
Magnetic Trap ◽  
Space Station ◽  
Coulomb Systems ◽  
Inhomogeneous Magnetic Field ◽  
Dust Particles ◽  
Charged Dust ◽  
Magnetic Traps ◽  
Space Experiments ◽  
Microgravity Conditions ◽  
New Space

We discuss the possibility of using static magnetic traps as an alternative to electrostatic traps for forming and confining structures of charged dust particles in a gas discharge plasma in the context of our study of strongly interacting Coulomb systems. Some advantages of confining structures in magnetic traps over electrostatic ones are shown. Also we provide a review of the related researches carried out first in laboratory conditions, and then under microgravity conditions including the motivation of performing the experiments aboard the International Space Station (ISS). The preparations of a new space experiment «Coulomb-magnet» as well as the differences of a new equipment from previously used are described. We proposed the main tasks of the new experiment as a study of the dynamics and structure of active monodisperse and polydisperse macroparticles in an inhomogeneous magnetic field under microgravity conditions, including phase transitions and the evolution of such systems in the kinetic heating of dust particles by laser radiation. Key words: Coulomb structures, magnetic trap, antiprobotron, diamagnetic particles, dust particles, microgravity.

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