Toroidal ion-temperature-gradient driven vortices in an inhomogeneous magnetoplasma with non-Maxwellian electrons

Mirza, Arshad M.; Masood, W.; Iqbal, Javed; Batool, Nazia

doi:10.1063/1.4930128

Cited by 13 publications

(11 citation statements)

References 36 publications

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“…Here, 𝜈 in is defined as the frequency of ion-neutral collision. Using the Equation ( 21) in (25), we arrive at following (1 + 1) dimensional nonlinear partial differential equation for the dissipative case…”

Section: Dissipative Casementioning

confidence: 99%

“…[24] Mirza et al studied the formation of nonlinear vortex structures in ITG mode in the presence of magnetic shear and suprathermal electrons. [25] They found that presence of hotter electrons in the system modify the scale length of vortex structures. Recently, Hassan et al [26] studied the effect of nonthermal electrons on the formation of solitons and shock in ITG-driven drift acoustic waves.…”

Section: Introductionmentioning

confidence: 99%

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Formation of solitons and shocks in toroidal ion temperature gradient mode in the presence ofnon‐Maxwellianelectrons

Hassan

Masood

Mirza

et al. 2021

Contributions to Plasma Physics

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Linear and nonlinear phenomena are investigated in toroidal ion temperature gradient (TITG)-driven pure drift mode. The model includes inhomogeneity in background magnetic field, ion temperature, and density. Finite Larmor radius effect is incorporated to understand the effect of low-frequency wave on ion dynamics. Electrons are assumed to follow nonthermal distribution, that is, kappa and Cairns distributions. Dispersion relation is obtained to analyse the linear behaviour of the TITG mode in the presence of non-Maxwellian electron distribution. In the nonlinear regime, exact solutions (soliton and shocks) are obtained (in dispersive and dissipative medium respectively) by using functional variable method to solve the nonlinear partial differential equation obtained for the system under consideration. Graphical illustrations are used to exhibit the characteristics of linear and nonlinear structures and their dependence on different physical parameters. It is observed that for TITG-driven pure drift mode, rarefactive solitons are formed for both thermal and nonthermal electron distributions. It is also observed that variation of electrons from standard thermal distribution affects the propagation characteristics of linear and nonlinear structures in TITG-driven modes. Results of our investigations will be helpful to understand the low-frequency waves in inhomogeneous plasmas in the presence of nonthermal electron distributions which are frequently observed by satellite missions and are also observed in laboratory plasmas.

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Section: Dissipative Casementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of solitons and shocks in toroidal ion temperature gradient mode in the presence ofnon‐Maxwellianelectrons

Hassan

Masood

Mirza

et al. 2021

Contributions to Plasma Physics

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“…and U=u− V 0 η represents the Doppler shifted velocity. In equation ( 16) by expressing ∂ ξ j=D ξ j since (∂ x j∂ ξ −∂ ξ j∂ x )j=0, we can express equation (16) as…”

Section: Stationary Solutions For Counter Rotating Vorticesmentioning

confidence: 99%

“…The investigation of nonlinear behavior of drift waves in a spatially inhomogeneous magnetoplasma leads to the development of structures like solitons, shocks and vortices. Many research papers have been dedicated to explore the formation of these structures and the study of their properties in ordinary electronion (e-i) [6,[10][11][12][13][14][15][16][17][18] and dusty plasmas [19].…”

Section: Introductionmentioning

confidence: 99%

Shear flow driven counter rotating vortices in non-uniform magnetoplasmas with warm ions and generalized (r, q) distributed electrons

2019

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We have analyzed the linear and nonlinear finite amplitude coupled drift ion acoustic waves in a spatially non-uniform plasma consisting of warm ions in the presence of sheared ion flow and electrons whose distribution in high and low phase space density regions is governed by two spectral indices, namely, r and q respectively. It has been found that stationary solution of the nonlinear equations in the form of a counter rotating vortex can be obtained for a particular choice of the equilibrium potential profile. It has been found that the double spectral indices r and q make a very pronounced effect on the formation and size of the counter-rotating vortices in spatially inhomogeneous plasmas and the applicability of the current study in understanding the wave phenomena with reference to space plasmas is also discussed.

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“…23 Important problems such as cyclotron heating and wave resonance with runaway (or superthermal) electrons have been considered by this approach. 24,25 Finally, it has been also observed that in a dusty plasma, the excess of superthermal plasma particles affects not only the wave-resonance characteristics (dispersion relations and damping/growth rates), but alters the resulting electrical charge of the dust particles as well. [26][27][28][29][30][31] Some theories have been proposed to address the origin of κVDFs from a fundamental set of postulates.…”

Section: Introductionmentioning

confidence: 99%

Obliquely propagating electromagnetic waves in magnetized kappa plasmas

Gaelzer

Ziebell

2016

Physics of Plasmas

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Velocity distribution functions (VDFs) that exhibit a power-law dependence on the high-energy tail have been the subject of intense research by the plasma physics community. Such functions, known as kappa or superthermal distributions, have been found to provide a better fitting to the VDFs measured by spacecraft in the solar wind. One of the problems that is being addressed on this new light is the temperature anisotropy of solar wind protons and electrons. In the literature, the general treatment for waves excited by (bi-)Maxwellian plasmas is well-established. However, for kappa distributions, the wave characteristics have been studied mostly for the limiting cases of purely parallel or perpendicular propagation, relative to the ambient magnetic field. Contributions to the general case of obliquely-propagating electromagnetic waves have been scarcely reported so far. The absence of a general treatment prevents a complete analysis of the wave-particle interaction in kappa plasmas, since some instabilities can operate simultaneously both in the parallel and oblique directions. In a recent work, Gaelzer and Ziebell [J. Geophys. Res. 119, 9334 (2014)] obtained expressions for the dielectric tensor and dispersion relations for the low-frequency, quasi-perpendicular dispersive Alfvén waves resulting from a kappa VDF. In the present work, the formalism is generalized for the general case of electrostatic and/or electromagnetic waves propagating in a kappa plasma in any frequency range and for arbitrary angles. An isotropic distribution is considered, but the methods used here can be easily applied to more general anisotropic distributions, such as the bi-kappa or product-bi-kappa.

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Toroidal ion-temperature-gradient driven vortices in an inhomogeneous magnetoplasma with non-Maxwellian electrons

Cited by 13 publications

References 36 publications

Formation of solitons and shocks in toroidal ion temperature gradient mode in the presence ofnon‐Maxwellianelectrons

Formation of solitons and shocks in toroidal ion temperature gradient mode in the presence ofnon‐Maxwellianelectrons

Shear flow driven counter rotating vortices in non-uniform magnetoplasmas with warm ions and generalized (r, q) distributed electrons

Obliquely propagating electromagnetic waves in magnetized kappa plasmas

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