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| 2. |
- Shukla, Nitin, et al.
(author)
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A new purely growing instability in a strongly magnetized nonuniform pair plasma
- 2007
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In: Physics Letters A. - : Elsevier. - 0375-9601 .- 1873-2429. ; 367:1-2, s. 120-122
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Journal article (peer-reviewed)abstract
- It is shown that a strongly magnetized nonuniform electron–positron (hereafter referred to as e–p or pair) plasma is unstable against low-frequency (in comparison with the electron gyrofrequency) electrostatic oscillations. For this purpose, a dispersion relation is derived by using the Poisson equation as well as the electron and positron continuity equations with the guiding center drifts for the electron and positron fluids. The dispersion relation admits a purely growing instability in the presence of the equilibrium density and magnetic field inhomogeneities. Physically, instability arises because of the inhomogeneous magnetic field induced differential electron and positron density fluctuations, which do not keep in phase with the electrostatic potential arising from the charge separation in our nonuniform pair plasmas.
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| 3. |
- Shukla, Nitin, et al.
(author)
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Ion streaming instability in a quantum dusty magnetoplasma
- 2008
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In: Physics of Plasmas. - : AIP Publishing. - 1070-664X .- 1089-7674. ; 15:1070-664X, s. 044503-1-044503-3
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Journal article (peer-reviewed)abstract
- It is shown that a relative drift between the ions and the charged dust particles in a magnetized quantum dusty plasma can produce an oscillatory instability in a quantum dust acousticlike wave. The threshold and growth rate of the instability are presented. The result may explain the origin of low-frequency electrostatic fluctuations in semiconductors quantum wells. (C) 2008 American Institute of Physics.
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| 4. |
- Shukla, Nitin, et al.
(author)
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Magnetization of a warm plasma by the nonstationary ponderomotive force of an electromagnetic wave
- 2009
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In: PHYSICAL REVIEW E. - : American Physical Society. - 1539-3755. ; 80, s. 027401-
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Journal article (peer-reviewed)abstract
- It is shown that magnetic fields can be generated in a warm plasma by the nonstationary ponderomotive force of a large-amplitude electromagnetic wave. In the present Brief Report, we derive simple and explicit results that can be useful for understanding the origin of the magnetic fields that are produced in intense laser-plasma interaction experiments.
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| 5. |
- Shukla, Nitin, et al.
(author)
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Nonlinear electromagnetic wave equations for superdense magnetized plasmas
- 2009
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In: PHYSICS OF PLASMAS. - : AIP Publishing. - 1070-664X .- 1089-7674. ; 16:7
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Journal article (peer-reviewed)abstract
- By using the quantum hydrodynamic and Maxwell equations, we derive the generalized nonlinear electron magnetohydrodynamic, the generalized nonlinear Hall-MHD (HMHD), and the generalized nonlinear dust HMHD equations in a self-gravitating dense magnetoplasma. Our nonlinear equations include the self-gravitating, the electromagnetic, the quantum statistical electron pressure, as well as the quantum electron tunneling and electron spin forces. They are useful for investigating a number of wave phenomena including linear and nonlinear electromagnetic waves, as well as three-dimensional electromagnetic wave turbulence spectra and structures arising from mode coupling processes at nanoscales in dense quantum magnetoplasmas.
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| 9. |
- Abdelsalam, UM, et al.
(author)
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Ion-acoustic solitary waves in a dense pair-ion plasma containing degenerate electrons and positrons
- 2008
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In: Physics Letters A. - Amsterdam : Elsevier. - 0375-9601 .- 1873-2429. ; 372:22, s. 4057-4061
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Journal article (peer-reviewed)abstract
- Fully nonlinear propagation of ion-acoustic solitary waves in a collisionless dense/quantum electron-positron-ion plasma is investigated. The electrons and positrons are assumed to follow the Thomas-Fermi density distribution and the ions are described by the hydrodynamic equations. An energy balance-like equation involving a Sagdeev-type pseudo-potential is derived. Finite amplitude solutions are obtained numerically and their characteristics are discussed. The small-but finite-amplitude limit is also considered and an exact analytical solution is obtained. The present studies might be helpful to understand the excitation of nonlinear ion-acoustic solitary waves in a degenerate plasma such as in superdense white dwarfs.
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| 10. |
- Abdelsalam, UM, et al.
(author)
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Localized electrostatic excitations in a Thomas-Fermi plasma containing degenerate electrons
- 2008
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In: Physics of Plasmas. - Melville : American Institute of Physics (AIP). - 1070-664X .- 1089-7674. ; 15:5
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Journal article (peer-reviewed)abstract
- By using the Thomas-Fermi electron density distribution for quantum degenerate electrons, the hydrodynamic equations for ions, and the Poisson equation, planar and nonplanar ion-acoustic solitary waves in an unmagnetized collisionless plasma are investigated. The reductive perturbation method is used to derive cylindrical and spherical Korteweg-de Vries equations. Numerical solutions of the latter are presented. The present results can be useful in understanding the features of small but finite amplitude localized ion-acoustic solitary pulses in a degenerate plasma.
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