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  • 2000-2004  (39)
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Material
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Year
  • 11
    Electronic Resource
    Electronic Resource
    Cylindrical and spherical dust ion–acoustic solitary waves (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1468-1470 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The properties of cylindrical and spherical dust ion–acoustic solitary waves (DIASWs) in an unmagnetized dusty plasma, whose constituents are inertial ions, Boltzmann electrons, and stationary dust particles, are investigated by employing the reductive perturbation method. The modified Korteweg–de Vries equation is derived and its numerical solutions are obtained. It has been found that the properties of the DIASWs in a nonplanar cylindrical or spherical geometry differ from those in a planar one-dimensional geometry. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1458030
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  • 12
    Electronic Resource
    Electronic Resource
    Shear Alfvén-like waves in a weakly ionized self-gravitating nonuniform dusty magnetoplasma (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 3513-3516 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dispersion properties of obliquely propagating ultra-low-frequency electromagnetic shear Alfvén-like waves in a weakly ionized, self-gravitating, nonuniform dusty magnetoplasma are examined. It is found that the electromagnetic shear Alfvén-like waves having the wavelength of the order of 10 AU and the wave period of the order of 30 000 years are unstable due to the effect of the self-gravitational force acting on the dust grains. The present investigation may be of relevance to the regions (namely, "warm photodisassociation regions") at the boundary between molecular clouds and H II regions surrounding hot early type stars. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1378326
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  • 13
    Electronic Resource
    Electronic Resource
    Nonlinear electrostatic waves in a magnetized dust-ion plasma (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 1529-1532 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that the nonlinear equation governing the dynamics of coupled dust-acoustic and dust-cyclotron waves in a magnetized dust-ion plasma can be written in the form of an energy integral. The latter is analyzed analytically as well as numerically to investigate the properties of arbitrary amplitude solitary waves. It is found both analytically as well as numerically that there exist solitary waves only with a negative potential. The implications of these results to some space and astrophysical dusty plasma systems, especially to planetary ring systems and cometary tails, are briefly discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1364512
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  • 14
    Electronic Resource
    Electronic Resource
    Tripolar vortices associated with toroidal ion temperature gradient modes in a magnetoplasma with sheared flows (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 846-849 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A system of nonlinear equations for low-frequency toroidal ion-temperature-gradient modes in a nonuniform magnetoplasma with sheared plasma flow is presented. For some specific profiles of the equilibrium density, the ion temperature and sheared plasma flows, the nonlinear equations admit a tripolar vortex. The numerical results show a negative potential vortex core between the lobs of a dipole-like structure which has a positive value of the potential. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1348038
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  • 15
    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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  • 16
    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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  • 17
    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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  • 18
    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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  • 19
    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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  • 20
    Electronic Resource
    Electronic Resource
    Enhanced electromagnetic emission from a dusty plasma (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1043-1045 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown how enhanced electromagnetic emission (EEE) is induced when large amplitude electromagnetic waves scatter off acoustic-like modes in a dusty plasma. Following the formalism of standard parametric interactions and using the Rostoker superposition principle, a general expression for the ensemble average of the square of the vector potential of EEE is derived. The result should be useful in deducing the plasma parameters in-situ when intense radar beams are used for the diagnosis of the polar mesospheric summer echos in association with low-frequency irregularities. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1446878
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