Low Frequency Electrostatic Modes in a Magnetized Gravitating Dusty Plasma with Nonthermal Ions

Mamun, A. A.; Alam, M. N.

doi:10.1088/0031-8949/57/4/011

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…Equation (31) resembles the condition obtained by Sharma and Patidar [50] for the consideration of the Maxwellian distribution of ions in collisionless self-gravitating dusty plasma. Further, the assumption that the Maxwellian distribution of electrons reduces instability condition (31) as 2 which is identical to the result given by Mamun and Alam [39] in the absence of polarization force and dust thermal velocity in the present work. The instability of the system can be discussed in a better manner via the critical wave length (l J ), above which the system remains stable, and the critical mass (M J ), above which the system starts collapsing.…”

supporting

confidence: 88%

“…Subsequently, in space and laboratory dusty plasmas, various regions are confined by an external magnetic field [37]. In this regard, much work has been done to examine the waves and Jeans instability in magnetized dusty plasma considering non-thermal ions/electrons [38,39], radiative condensation [40,41] and polarization force [42]. Moreover, the charge on the dust gives an additional dynamical quantity in the plasma as well as generating new dusty modes for example dust acoustic waves [43], dust lattice waves [44], dust ion acoustic waves [45], etc.…”

Section: Introductionmentioning

confidence: 99%

“…In equations(39) and(40), the terms on the left side are assumed to be a function of k, i.e. f (k * ).…”

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confidence: 99%

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Analysis of radiative gravitational modes in magnetized dusty plasma with non-thermal ion distribution

Patidar¹,

Jain²,

Sharma³

2019

Phys. Scr.

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The characteristics of radiative gravitational modes in non-thermal magnetized dusty plasma with charge fluctuation and the polarization force of dust particles are investigated. The electron species are assumed to be radiative and the ions are assumed to be non-thermal. A normal mode analysis is applied to derive the general dispersion relation for radiative magnetized selfgravitating dusty plasma. Modified radiative condensation and self-gravitational instability criteria for both perpendicular and parallel modes of propagation are obtained. Analytically, it is found that the presence of a non-thermal ion population significantly modified the usual radiative condensation instability criterion, and damped the growth rate of the radiative mode. The obtained analytical results are further discussed in the numerical result section. We investigate the fact that the non-thermal ion population acts as a stabilizing source for radiative condensation instability in magnetized self-gravitating dusty plasma fluid, including the dust polarization force and charge fluctuation. The thermal conductivity with non-thermal ion distribution quickly moves the system towards stability. The implications of the results in the region of the interstellar medium (ISM) are discussed.

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confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Analysis of radiative gravitational modes in magnetized dusty plasma with non-thermal ion distribution

Patidar¹,

Jain²,

Sharma³

2019

Phys. Scr.

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“…by Mamun and Alam [29] in dimensional form. Thus it is clear that the present RC mode is modified due to the combined effects of polarization force, dust thermal speed, magnetic field and self-gravitation for a partially ionized plasma system.…”

Section: Linearized Perturbation Equations and Dispersion Relationmentioning

confidence: 99%

Radiative condensation instability in partially ionized dusty plasma with polarization force

Sharma¹,

Jain²

2015

Phys. Scr.

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This paper studies the effect of polarization force on the radiative condensation (RC) instability of a partially ionized dusty medium both in the presence and absence of self-gravitation. The temperature and density dependent heat loss function is considered in the process of heating and radiative cooling. The linear-perturbation analysis is used to derive general dispersion relation and criteria for both the Jeans and RC instability. The condition of Jeans instability is modified due to the RC, polarization force, magnetic field and dust thermal speed, whereas in the case of RC instability the instability criterion is modified due to the presence of dust thermal speed, magnetic field and polarization force. The effects of various parameters have been numerically estimated on RC instability. It is clear from figure that the presence of polarization parameter and density dependent heat-loss function destabilize the system while the presence of temperature dependent heat-loss function, dust neutral collision frequency and ratio of neutral dust density stabilize the system. These findings are relevant for many areas of space and laboratory plasma research prime examples being the formation of dense molecular clouds in interstellar and intergalactic medium, condensations in planetary nebulae and in laboratory plasmas like tokamak edge plasma.

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Dust-cyclotron and dust-lower-hybrid modes in self-gravitating magnetized dusty plasmas

2003

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A theoretical investigation has been made of two new ultra-low-frequency electrostatic modes, namely, dust-cyclotron mode and dust-lower-hybrid mode, propagating perpendicular to the external magnetic eld, in a self-gravitating magnetized two uid dusty plasma system. It has been shown that the e ect of the self-gravitational force, acting on both dust grains and ions, signi cantly modi es the dispersion properties of both of these two electrostatic modes. It is also found that under certain conditions, this self-gravitational e ect can destabilize these ultra-low-frequency electrostatic modes. The implications of these results to some space and astrophysical dusty plasma systems, especially to planetary ring-systems and cometary tails, are brie y mentioned. MIRAMARE TRIESTE

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Low Frequency Electrostatic Modes in a Magnetized Gravitating Dusty Plasma with Nonthermal Ions

Cited by 11 publications

References 13 publications

Analysis of radiative gravitational modes in magnetized dusty plasma with non-thermal ion distribution

Analysis of radiative gravitational modes in magnetized dusty plasma with non-thermal ion distribution

Radiative condensation instability in partially ionized dusty plasma with polarization force

Dust-cyclotron and dust-lower-hybrid modes in self-gravitating magnetized dusty plasmas

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