Roles of positively charged dust in the formation of ion‐acoustic subsonic solitary waves in electron‐ion‐positively charged dust plasmas

Mamun, A. A.

doi:10.1002/ctpp.202000192

Cited by 11 publications

(2 citation statements)

References 36 publications

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“…On the other hand, the electron species in space environments mentioned does not always follow the Maxwellian electron velocity distribution function. This means that the linear dispersion relation (2), and the works of Mamun and Sharmin [15] and Mamun [16] are valid for a cold ion fluid (T i = 0) limit and for the Maxwell electron velocity distribution function, which can be expressed in one dimensional (1D) normalized [normalized by n e0 /V Te , where V Te = (k B T e /m e ) 1/2 is the thermal speed of the electron species, and v is normalized by V Te ] form as…”

Section: Introductionmentioning

confidence: 97%

“…Recently, based on this new linear feature, Mamun and Sharmin [15] and Mamun [16] have shown the existence of subsonic shock and SWs, respectively, by considering the assumption of Maxwellian electron species and cold ion species. The IA waves in different plasma systems composed of ions and electrons have also been studied by a number of authors [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Solitary waves and double layers in complex plasma media

Mamun

Mannan

2021

Preprint

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A complex plasma medium (containing Cairns nonthermal electron species, adiabatically warm inertial ion species, and stationary positively charged dust (PCD) species (making a plasma system very complex) is considered. The effects of PCD species, nonthermal electron species, and adiabatic ion-temperature on ion-acoustic (IA) solitary waves (SWs) and double layers (DLs) are investigated by the pseudo-potential approach, which is valid for the arbitrary amplitude time-independent SWs and DLs. It is observed that the presence of the PCD species reduces the phase speed of the IA waves, and consequently supports the IA subsonic compressive SWs in such electron-ion-PCD plasmas. On the other hand, the increase in both adiabatic ion-temperature and the number of nonthermal or fast electrons causes to reduce the possibility for the formation of the subsonic SWs, and thus convert subsonic SWs into supersonic ones. It is also observed that after at a certain value of the nonthermal parameter, the IA supersonic SWs with both positive and negative potentials as well as the DLs with only negative potential exist. The applications of the work in space environments (viz. Earth's mesosphere, cometary tails, Jupiter's magnetosphere, etc.) and laboratory devices, where the warm ion and nonthermal electron species along with PCD species have been observed, are briefly discussed.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Solitary waves and double layers in complex plasma media

Mamun

Mannan

2021

Preprint

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Variable dust charge generates a special type of nonlinear structures through modified Gardner equations

Ghosh

2022

Contributions to Plasma Physics

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Nonlinear damped modified Gardner equation is derived from the dust hydrodynamic model in dusty plasma, which is collisional, unmagnetized, and has two temperature ions. An extended version of the reductive perturbation technique (RPT) is used to derive the said equations. Approximate analytical solitary wave solution is obtained for compositional parameters near the critical composition. It is found that various nonlinear structures like super periodic, superhomoclinic, and special types of nonlinear structures are emerging while an investigation is done through the system of first‐order differential equations. The effects of different plasma parameters like collisions and dust charge variables on the wave structures have been noticed. In the circumstances of nebulas, interstellar clouds, planetary magnetospheres, and cometary environments recognized by astrophysicists, Voyager spacecraft observation on the fine structure of Saturn's rings, semiconductor devices, it has been investigated that the dust charge variable modifies the super nonlinear structures significantly.

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Nonlinear ion‐acoustic waves in magnetized plasmas in presence of energetic electrons and positively charged dust

Orani

Akter

Mamun

2022

Contributions to Plasma Physics

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A theoretical investigation has been carried out for exploring different features of ion-acoustic solitary and shock waves in a three-component magnetized plasma containing a mixture of thermal and nonthermal (energetic) inertialess electrons, warm inertial ions, and positively charged stationary dust particles. The standard Korteweg-de Vries (Burgers) equation has been derived by employing the reductive perturbation method, and its solitary (shock) wave solution has been derived and examined analytically as well as numerically. The latter exhibits characteristic properties (amplitude, width, speed, and polarity) of the ion-acoustic solitary and shock waves. It has been shown that the ion-acoustic solitary and shock waves are significantly modified by different plasma parameters (viz. parameter measuring the ratio of dust charge density to ion charge density, parameter measuring the fraction of energetic electrons, parameter measuring ion or electron temperature, and the external magnetic field). The present investigation may help in understanding the physics of various nonlinear phenomena formed in many space plasma systems, (viz. earth's mesosphere, solar wind, and cometary tails) and laboratory devices (laboratory experiments

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Roles of positively charged dust in the formation of ion‐acoustic subsonic solitary waves in electron‐ion‐positively charged dust plasmas

Cited by 11 publications

References 36 publications

Solitary waves and double layers in complex plasma media

Solitary waves and double layers in complex plasma media

Variable dust charge generates a special type of nonlinear structures through modified Gardner equations

Nonlinear ion‐acoustic waves in magnetized plasmas in presence of energetic electrons and positively charged dust

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