Drift dust acoustic soliton in the presence of field-aligned sheared flow and nonextensivity effects

Shah, AttaUllah; Ahmad, Masood; Farooq, Muhammad; Khan, Aurangzeb; Rehman, Aman‐ur

doi:10.1063/1.5038020

Cited by 3 publications

(1 citation statement)

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“…We consider four component magnetized dusty plasma containing positively and negatively charged dust grains, thermal ions, and non‐Maxwellian electrons described by the hybrid Cairns–Tsallis velocity distribution. The present model of dusty plasma has been observed in different regions of space such as cometary tails, upper mesosphere, Jupiter's magnetosphere, [ 15,62 ] and so forth. Low frequency electrostatic DAW is studied under the effect of polarization force, which arises due to the interaction between the inertia less particles and heavily charged dust grains.…”

Section: Plasma Model and Polarization Forcementioning

confidence: 99%

Polarization force in an opposite polarity dusty plasma with hybrid Cairns–Tsallis distributed electrons

Farooq

Ahmad

Jan

2021

Contributions to Plasma Physics

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The effect of polarization force acting on oppositely charged dust grains in magnetized plasma is analysed for obliquely propagating low frequency electrostatic waves with Maxwellian ions, and non‐Maxwellian electrons following the hybrid Cairns–Tsallis velocity distribution. It is shown that the polarization force acting on positively charged dust grain is different from the one acting on negatively charged dust grain in the presence of hybrid Cairns–Tsallis distributed electrons. A nonlinear equation in the form of Zakharov–Kuznetsov equation is derived via perturbation analysis for the description of electrostatic solitary structures in the limit of weak‐amplitude. A parametric investigation determines the modifications arising in the propagation of dust acoustic soliton due to the presence of polarization force and hybrid Cairns–Tsallis distributed electrons. It is also found that the effect of polarization force is more pronounced for heavier dust grain with high charge number. Finally, there is a lower limit found for the q‐nonextensive parameter, below which modifications in soliton profile cease to exist due to the presence of hybrid Cairns–Tsallis distributed electrons.

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Section: Plasma Model and Polarization Forcementioning

confidence: 99%

Polarization force in an opposite polarity dusty plasma with hybrid Cairns–Tsallis distributed electrons

Farooq

Ahmad

Jan

2021

Contributions to Plasma Physics

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Formation of large‐scale structures in four‐component dusty plasmas

Gondal

Iqbal

Saleem

et al. 2019

Contributions to Plasma Physics

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A possibility of self-organization of magnetized four-component dusty plasmas to double Beltrami (DB) state is explored. It is found that for a specific set of Beltrami parameters, the four-component dusty plasma self-organizes to DB state. The DB state characterized by two scale parameters may represent a paramagnetic or diamagnetic field structure. The impact of Beltrami parameters, charge and densities of dust grains on formation of self-organized structures has also been investigated. This study has potential relevance to the formation of large-scale structures in astrophysical plasmas. K E Y W O R D SBeltrami parameters, dusty plasma, self-organization INTRODUCTIONRecently, dusty plasmas have become very popular because of their presence in laboratory as well as in space [1][2][3] and astrophysical environments, for example, they are found in Jupiter's magnetosphere, [1,2,4] upper mesosphere, [5] cometary tails, [2,6,7] planetary rings, [8] and so on. A dusty plasma is a collection of bulky charged dust fluids which also contain electrons and ions. The dusty plasmas comprising of a mixture of electrons, ions, and negatively charged dust grains have been studied extensively [9][10][11][12][13][14][15][16] because in low temperature plasmas, the electrons have high thermal speed in comparison to ions and are more likely to attach the massive dust particles. However, the plasmas containing positively charged dust grains have also been found in Jupiter's magnetosphere, [4] upper mesosphere, [5] and cometary tails. [3,7,16] The positively charged dust grains are created due to three emission processes namely photoemission, [17] secondary emission, [7] and thermionic emission. [18] It has also been observed that both type of negatively and positively charged dust grains are found in a variety of space [1-3] and astrophysical objects namely Jupiter's magnetosphere, [4] upper mesosphere, [5] and cometary tails. [3,7,16] It has been investigated theoretically that the dimensions of dust particles play an important role in the creation of positive and negative dust grains. It is found that dust grains with smaller sizes are more likely to be charged positively while the heavier ones get negatively charged. [7] However, through mechanism of triboelectric charging, it is possible that heavy dust grains become positively charged and the smaller ones become negatively charged. [11,19,20] A variety of eigenmodes in dusty plasmas [21] like dust acoustic waves, [22] dust drift mode, [23] dust cyclotron acoustic waves, [24] dust lattice waves, [25,26] and so on have been investigated in dusty plasmas. The ion-acoustic solitons having large amplitudes have been studied in dusty plasmas composed of electrons, cold ions, and negatively charged dust grains by Bharuthram [12] while in four-component (two ions of opposite polarities, electrons and immobile dust particles) collisional dusty plasma, the acoustic solitary waves have been studied by Misra. [27] The dynamics of charged dust in the solar atmosphere has been studied by Ho...

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Charged particles energization during magnetic reconnection in the Earth’s magnetosphere by double layers: an analytical approach

Shamir

Khan

Murtaza

2021

Monthly Notices of the Royal Astronomical Society

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Charged particles energization at the magnetic reconnection sites in the Earth’s magnetosphere is a subject of active debate in space plasma, specifically in magnetopause and magnetotail regions. In the proximity of the reconnection region, Magnetospheric Multiscale (MMS) and other satellite missions have confirmed the existence of electron acceleration ranging from 100 keV to MeV. There is also evidence of cold ions acceleration in the separatrix region of the Earth’s magnetopause. An important candidate responsible for charged particles acceleration is believed to be the double layer (DL) structures, and which were first observed by the Cluster satellite in the separatrix region of the Earth’s magnetosphere. Moreover, the MMS mission also observed parallel electric field fluctuations up to 100 mV/m carried by DL at the magnetic reconnection site in the Earth’s magnetosphere. Motivated by the reported literature, we investigate the DL and its associated electric field at the magnetopause magnetic reconnection site by using a simple analytical model in which the DLs associated with kinetic Alfvén waves are studied in a low- $\beta$ electron-ion plasma with Tsallis distributed electrons and fluid ions using the Sagdeev potential technique. The non-extensive parameter (superthermality) of the Tsallis distribution has a pronounced effect on the DL’s strength (as defined by the potential drop) and its associated parallel electric field. Our results are consistent with the earlier studies on DLs in Earth’s magnetosphere. Additionally, we discuss the implications of our findings on charged particle energization in the separatrix region of the Earth’s magnetopause during magnetic reconnection.

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Drift dust acoustic soliton in the presence of field-aligned sheared flow and nonextensivity effects

Cited by 3 publications

References 51 publications

Polarization force in an opposite polarity dusty plasma with hybrid Cairns–Tsallis distributed electrons

Polarization force in an opposite polarity dusty plasma with hybrid Cairns–Tsallis distributed electrons

Formation of large‐scale structures in four‐component dusty plasmas

Charged particles energization during magnetic reconnection in the Earth’s magnetosphere by double layers: an analytical approach

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