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  • 2000-2004  (16)
  • 2000  (16)
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  • 2000-2004  (16)
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  • 1
    Electronic Resource
    Electronic Resource
    Electrostatic drift-like waves in a bounded dusty plasma (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 3499-3504 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A number of different types of obliquely propagating dust-associated electrostatic drift-like waves, namely, the Shukla–Varma mode, the lower-hybrid mode, coupled electron–drift–dust–ion–acoustic waves, coupled ion–drift–dust–electron–acoustic waves, coupled dust–drift–dust–acoustic waves, and coupled dust–drift–dust–cyclotron waves, in a nonuniform bounded dusty magnetoplasma are theoretically investigated. The last two are studied by considering the dynamics of the negatively charged dust grains, whereas the other ones are studied by considering the presence of the static dust grains. The dispersion properties of these drift-like waves, which are found to be significantly modified by the combined effects of plasma density inhomogeneity, finite boundary of the dusty plasma, obliqueness of the propagating mode, and external magnetic field, are examined. The relevance of this investigation to low-temperature laboratory dusty magnetoplasmas is discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287139
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  • 2
    Electronic Resource
    Electronic Resource
    Dust ion-acoustic shocks and holes (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1044-1046 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Properties of dust ion-acoustic (DIA) shocks and DIA holes are examined, assuming that a dusty plasma contains immobile charged dust grains, warm electrons, and warm ions. A Kortweg-deVries- Burgers equation for DIA shocks is derived by employing the hydrodynamic equations for the warm ion fluid and the Boltzmann electron density distribution. On the other hand, DIA holes arise when the warm ions follow a trapped vortex distribution. The profiles of DIA shocks and DIA holes are discussed. The results are useful for understanding the salient features of DIA shocks and holes that are recently observed in laboratory dusty plasma devices. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873905
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  • 3
    Electronic Resource
    Electronic Resource
    Generation of localized density perturbations by shear Alfvén waves (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 2738-2739 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that the ponderomotive force of finite amplitude shear (or kinetic) Alfvén waves can generate magnetic field-aligned quasistationary density humps as well as dips. The results can have relevance to the shear Alfvén wave induced localized density perturbations that have been recently found in the Large Plasma Device at the University of California, Los Angeles, as well as to those observed by spacecrafts in the Earth's auroral and magnetospheric plasmas. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.874124
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  • 4
    Electronic Resource
    Electronic Resource
    Comment on "On the existence of Alfvénic solitary waves" [Phys. Plasmas 6, 4778 (1999)] (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 2747-2748 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is argued that Seyler and Lysak [Phys. Plasmas 6, 4778 (1999)] have reached an ambiguous conclusion with regard to the existence of planar dispersive Alfvénic solitary waves in a uniform magnetoplasma. The properties of dispersive inertial and kinetic Alfvén waves are re-examined, and shortcomings of Seyler and Lysak's work are pointed out. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.874119
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  • 5
    Electronic Resource
    Electronic Resource
    Generation of zonal flows by drift waves in a dusty plasma (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 3822-3825 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is well known that the spectra of electrostatic drift waves and convective cells are modified by the presence of stationary charged dust grains in a nonuniform dusty magnetoplasma. While modification of the drift wave frequency is caused by the modification of the equilibrium quasineutrality condition, purely damped convective cells of an electron–ion plasma obtain a real frequency due to the finite E×B0 currents in a nonuniform dusty magnetoplasma, where E is the wave electric field and B0 is the external magnetic field. It is shown that the ponderomotive force of electrostatic drift waves in a dusty plasma can generate zonal flows or dust convective cells. Explicit expressions for the growth rates of parametrically excited zonal flows are presented. The growth rates strongly depend on the dust parameters. Linearly unstable zonal flows can self-organize in the form of long-living vortices. Such nonlinear zonal flow structures constitute a dynamical paradigm for intermittency in drift wave driven long wavelength turbulence in a nonuniform dusty magnetoplasma. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287825
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  • 6
    Electronic Resource
    Electronic Resource
    Electromagnetic effects on toroidal-ion-temperature-gradient modes and associated nonthermal cross-field transports (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1132-1138 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electromagnetic effects are incorporated in the study of toroidal ion-temperature-gradient (ITG) modes in a nonuniform magnetoplasma. For this purpose, dispersion relations have been derived by employing the fluid and gyrokinetic responses for the ions, as well as the fluid electron response along with Ampère's law. The dispersion relations are numerically analyzed and results for the real and imaginary parts of the ITG wave frequencies are displayed for different values of cursive-epsilonn=2Ln/LB (where Ln and LB are the characteristic scale lengths of the density and magnetic field gradients, respectively) and λi(parallel)=k(parallel)λi, where k(parallel) is the parallel component of the wave vector and λi is the collisionless ion skin depth. It is found that electromagnetic effects are stabilizing. Furthermore, also presented are brief calculations of particle as well as ion thermal transports in the presence of nonthermal electromagnetic fluctuations. The relevance of this investigation to the plasma confinement in tokamaks is discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873921
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  • 7
    Electronic Resource
    Electronic Resource
    Instability of a broadband Langmuir wave spectrum in a dusty plasma (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4446-4449 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear interaction between broadband Langmuir waves and electrostatic dust–acoustic perturbations in a uniform collisional dusty plasma is considered, taking into account the combined effects of the Langmuir wave ponderomotive force and the electron Joule heating nonlinearity. This coupling is governed by a Liouville equation for a Langmuir wave packet and an equation for a dust–acoustic perturbation that is driven by the ponderomotive and thermal forces of the random phase Langmuir waves. The mode coupling equations are then Fourier decomposed to derive the nonlinear dispersion relation. The latter is analyzed numerically for a Gaussian Langmuir wave spectrum, by taking parameters that are relevant for low-temperature dusty plasma discharges. It is found that a broadband spectrum of Langmuir waves is subjected to a rapidly growing modulational instability in a dusty plasma. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1312820
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  • 8
    Electronic Resource
    Electronic Resource
    Dust acoustic waves with dust charge fluctuations—revisited (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1614-1616 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dust acoustic wave spectrum is rederived, taking into account dust charge fluctuations that are produced by orbital-motion limited and secondary electron currents in an unmagnetized dusty plasma containing negative or positive dust grains. It is found that the secondary electron current reduces the magnitude of fluctuating electron currents, which affect the propagation of the dust acoustic waves. The relevance of this investigation to enhanced scattering of electromagnetic waves off the dust-acoustic waves in the Earth's polar mesosphere is discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873983
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  • 9
    Electronic Resource
    Electronic Resource
    Instabilities of self-gravitating dusty clouds in magnetized plasmas (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 3762-3770 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A rigorous theoretical investigation has been made of electromagnetic modes and associated filamentational instabilities in a nonuniform, partially ionized, self-gravitating, dusty magnetoplasma, taking into account the effects of the neutral fluid dynamics, inhomogeneities in the external magnetic field and the plasma density, the drag forces, the ionization and recombination, etc. It is found that there exist two new types of filamentational instabilities; one type is due to the combined effects of collisions of dust particles or ions with stationary neutrals and the self-gravitational force, and the other type is due to the combined effects of the dusty plasma and the neutral fluid dynamics. Furthermore, the effects of the external magnetic field and its inhomogeneity, the neutral fluid temperature, collisions of dust particles with neutrals, and the ionization play the stabilizing role, whereas the effects of the neutral fluid mass density, the plasma number density inhomogeneity, collisions of ions with neutrals, and the recombination play the destabilizing role. The newly found instabilities may be responsible for the formation of stars in galaxies via fragmentation or filamentation of interstellar dense molecular clouds.© 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287739
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  • 10
    Electronic Resource
    Electronic Resource
    Streaming instabilities in a collisional dusty plasma (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4412-4417 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A pair of low-frequency electrostatic modes, which are very similar to those experimentally observed by Praburam and Goree [Phys. Plasmas 3, 1212 (1996)], are found to exist in a dusty plasma with a significant background neutral pressure and background ion streaming. One of these two modes is the dust-acoustic mode and the other one is a new mode which is due to the combined effects of the ion streaming and ion–neutral collisions. It has been shown that in the absence of the ion streaming, the dust-acoustic mode is damped due to the combined effects of the ion–neutral and dust–neutral collisions and the electron–ion recombination onto the dust grain surface. This result disagrees with Kaw and Singh [Phys. Rev. Lett. 79, 423 (1997)], who reported collisional instability of the dust-acoustic mode in such a dusty plasma. It has also been found that a streaming instability with the growth rate of the order of the dust plasma frequency is triggered when the background ion streaming speed relative to the charged dust particles is comparable or higher than the ion–thermal speed. This point completely agrees with Rosenberg [J. Vac. Soc. Technol. A 14, 631 (1996)]. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1315305
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