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  • Elsevier  (18)
  • American Institute of Physics  (14)
  • American Institute of Physics (AIP)  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    Nonlinear field line resonances: Dispersive effects (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 3565-3574 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model is presented which describes the nonlinear interaction of dispersive shear Alfvén wave (SAW) field line resonances (FLRs) and ion acoustic waves (IAWs), with applications to the Earth's magnetosphere. Two limits are considered: In low-β plasma (β〈me/mi), dispersion is dominated by electron inertia (EI), while for higher β it is dominated by the electron thermal effect. In each case, the ponderomotive force steepens the SAW in the radial direction, taken as earthward in the equatorial plane. Following the time of nonlinear steepening, the dynamics strongly depends on dispersion. In the EI case, standing SAWs excited in FLRs exhibit a parametric decay instability (PDI) into secondary SAWs and IAWs. Nonlinearity and dispersion broaden the FLR in the radial direction, leading to rapid density and parallel electric field fluctuations and scale lengths comparable to the EI length. In warm plasmas, SAWs are stable to the PDI, and in this case the FLR emits short perpendicular scale SAW-IAW solitons in the anti-earthward direction. Observational consequences of both scenarios are discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873075
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  • 2
    Electronic Resource
    Electronic Resource
    Electron kinetic effects in standing shear Alfvén waves in the dipolar magnetosphere (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 2630-2645 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electron kinetic response to an electric current driven by a standing shear Alfvén wave (SAW) is considered for the case of a dipolar geometry. The parallel electric field is found from the electron gyrokinetic equation along with the SAW dispersion coefficient. Electron trapping in the dipolar magnetic field significantly reduces the parallel electric conductivity and in this way increases the amplitude of the parallel electric field and SAW dispersion. It is demonstrated that the two-fluid hydrodynamic equations used by many authors significantly underestimate the electron response and, consequently, the magnitude and location of the parallel electric field under conditions where the electron bounce frequency is larger than the SAW frequency. This is especially important in a plasma with density depressions near the Earth's polar magnetosphere. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.874105
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  • 3
    Electronic Resource
    Electronic Resource
    Shear flow vortices in magnetospheric plasmas (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 829-840 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Theory and numerical simulations are used to investigate the nonlinear evolution of vortices generated by the Kelvin–Helmholtz (KH) instability of sheared plasma flows in the Earth's magnetosphere. The extent of broadening of the shear flow, and the energy and enstrophy exchange between the shear flow and KH vortices, is characterized. A new stationary vortex street solution is found, and two distinct phases of the nonlinear dynamics are identified. The first involves a transient phase in which burst-like pulsations of the flow lead to a rapid dissipation of enstrophy. After the transient phase, an asymptotic state is reached that corresponds to a periodic chain of pairs of monopolar vortices. The consequences of the model results for the dynamics of field line resonances (FLRs) in the Earth's magnetosphere are discussed, and it is shown, in particular, that broadening of the flow correlates well with observations of periodic reforming of FLR structures. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872149
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear dynamics of standing shear Alfvén waves (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 501-515 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear evolution of driven standing shear Alfvén waves is investigated by virtue of a model which includes the interaction of the waves with density perturbations excited by the ponderomotive force. It is shown that the plasma density perturbations take the form of a slow magnetosonic wave which nonlinearly shifts the frequency of the shear Alfvén wave and decouples it from the external source. This results in a complicated and sometimes chaotic temporal behavior of the amplitude of the excited waves which depends strongly on the plasma pressure, driver strength, and the frequency mismatch between the driver and shear Alfvén eigenmode. The results are discussed in the context of ultra low frequency (ULF) field line resonances in the Earth's magnetosphere and the excitation of waves in the Alfvénic wave resonator near to the polar ionosphere. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870975
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  • 5
    Electronic Resource
    Electronic Resource
    Diffraction, self-focusing, and the geometrical optics limit in laser produced plasmas (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 1521-1525 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of diffraction on the self-modulation of an intense laser beam in an initially uniform hydrogen plasma is investigated. A formalism is used in which the diffraction term in the paraxial wave equation can be arbitrarily reduced by the use of a weight factor ι. In the limit where ι approaches zero, it is shown that the paraxial wave equation correctly reduces to the geometrical optics limit and that the problem then becomes formally equivalent to solving the ray-tracing equations. When ι=1, the paraxial wave equation takes its usual form and diffraction is fully accounted for. This formalism is applied to the simulation of self-modulation of an intense laser beam in a hydrogen plasma, for which diffraction is shown to be significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866266
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical simulations of charge state distribution from a KrF laser-produced plasma (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 4115-4122 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A calculation of the charge state distribution of the asymptotic evolution of a plasma produced by an ultraviolet laser has been carried out by coupling the results of a detailed two-dimensional hydrodynamic simulation of the creation and heating of the plasma to a simpler one-dimensional hydrodynamic code. The latter incorporates time-dependent ionization and recombination physics and is used to model the subsequent expansion and cooling of the plasma. The simulation results are compared to experimental charge state distributions obtained by using a single shot electrodynamic charge analyzer. The sensitivity of the results to the rate coefficients used for the recombination calculations was tested and the calculated distributions were found to be most sensitive to the values of the three-body recombination rate and the amount of heat returned to the plasma. Reasonable agreement was found between the measured and calculated charge state distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860580
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  • 7
    Electronic Resource
    Electronic Resource
    Kinetic theory of stimulated Raman sidescattering from magnetized plasmas (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 3380-3386 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theory of stimulated Raman sidescattering in magnetized plasmas is presented based on a solution of the Vlasov–Maxwell equations. The incident laser light, in the form of extraordinary mode radiation, decays into light waves which propagate along the uniform magnetic field as right or left circularly polarized waves. The scattered plasma mode is an obliquely propagating electron-Bernstein wave. The possible relevance of the theory to experiments in which structure is observed in radiation at one-half of the laser frequency is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865337
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  • 8
    Electronic Resource
    Electronic Resource
    Numerical simulations of induced spatial incoherence laser light self-focusing (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 2437-2449 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of induced spatial incoherence (ISI) on laser light self-focusing is investigated using a two-dimensional Eulerian hydrodynamic plasma simulation code. In homogeneous low-density plasmas (one-tenth of the critical density for radiation of wavelength λL=0.25 μm) it is found that ISI can effectively eliminate thermal and ponderomotive self-focusing for a wide range of intensities. In plasma containing an initial linear gradient in density, strong self-focusing occurs when the maximum intensity in the incident light I0 (where I0 represents the intensity that would be achieved for a perfectly coherent beam) is allowed to approach 1017 W cm−2. At lower intensities, I0∼1016 W cm−2, thermal self-focusing is eliminated and ponderomotive self-focusing is significantly reduced. The dwell time of the filamented light varies from the laser light coherence time to a few tens of picoseconds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859179
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  • 9
    Electronic Resource
    Electronic Resource
    Finite Larmor radius effects in stimulated Raman scattering (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 1193-1195 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stimulated Raman scattering from a magnetized plasma has been examined using the set of Vlasov–Maxwell equations. The incident laser light, propagating in the form of an extraordinary mode, decays into a scattered extraordinary mode together with electron-Bernstein waves. For sufficiently strong magnetic fields and high electron temperatures, the growth rates of these waves become comparable to the field-free values. At relatively low plasma densities the magnetic field can result in scattered light at ω0/2 (where ω0 is the laser frequency), a frequency associated with radiation emitted from the quarter-critical density region of unmagnetized plasmas. We have compared the results from the kinetic theory analysis with observations from numerical experiments using a 1 1/2 -D electromagnetic particle code and found them to be in good agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.864994
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  • 10
    Electronic Resource
    Electronic Resource
    Inverse resonance absorption in an inhomogeneous magnetized plasma (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 16-18 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The linear mode conversion of a plasma wave to a light wave in a magnetized plasma has been examined theoretically and by computer simulation. This conversion is the inverse of resonance absorption exhibiting an identical dependence on magnetic field and density scale length with an optimum conversion efficiency of approximately 60%. Radiation from this source may contribute to the harmonic spectra observed from laser-irradiated plasmas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865177
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