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  • 1
    Electronic Resource
    Electronic Resource
    Response to "Comment on ‘On the existence of Alfvénic solitary waves' " [Phys. Plasmas 7, 2747 (2000)] (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 2749-2749 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.874120
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  • 2
    Electronic Resource
    Electronic Resource
    On the existence of Alfvénic solitary waves (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 4778-4780 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is argued that dispersive Alfvén solitary waves of the nonoscillatory type do not exist in one dimension. Previous calculations that claim existence have neglected the nonlinear ion polarization drift in the low-frequency limit. If the nonlinear ion polarization term is retained or if no low-frequency assumption is made, solitary wave solutions are not found. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873766
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetic stabilization of interchange modes in an axisymmetric mirror by large orbit radius thermal ions (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1015-1025 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A dispersion functional analysis that includes the full kinetic effects of large Larmor radius thermal ions is applied to the problem of stability of an axisymmetric mirror to finite azimuthal mode number (m) interchange modes. Vlasov theory is used to describe the ions, which are imbedded in a background of fluid electrons. The dispersion functional is solved numerically, both for a trial function displacement, where only the growth rate is determined, and the general case, where both the displacement and the growth rate are determined. In the trial function case, it is found that finite Larmor radius (FLR) effects are recovered, with a significant reduction in the growth rate when (ρi/L)2(approximately-greater-than)γMHD/Ωi. In a general case, the growth rate is reduced, but not so strongly as in the trial function case. It is shown heuristically that FLR effects may be recovered from the analysis and that these effects increase with the phase-space decorrelation time of the thermal ion distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859830
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  • 4
    Electronic Resource
    Electronic Resource
    Symmetry properties of a multidimensional dispersion functional (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 2414-2428 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Symmetry properties are presented for a multidimensional dispersion functional. If the system of linearized Vlasov-field equations is "completely Hamiltonian,'' the dispersion operator satisfies a certain formal self-adjointness property as a function of omega. For appropriate boundary conditions this implies a relation between an eigenfunction and its dual. If the equilibrium admits "conjugate orbits'' for a completely Hamiltonian system and if the "conjugate-orbit parity condition'' is satisfied, then the kinetic part of the dispersion matrix is symmetric. For this case and for appropriate boundary conditions the entire dispersion matrix for the multispecies Vlasov or Vlasov-fluid models is symmetric. It then follows that the complex conjugate of the dual eigenfunction is proportional to the eigenfunction itself. The analytic continuation of the dispersion functional of the linearized Vlasov-field equations into the lower half of the frequency plane is derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866132
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  • 5
    Electronic Resource
    Electronic Resource
    Stimulated Raman scattering of nonlinear space-charge and transverse magnetic waves with a longitudinal wiggler (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 190-199 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A formulation is given for the parametric coupling of nonlinear space-charge waves with transverse magnetic (TM) waveguide modes through a longitudinal wiggler field. The model is based upon the simplifying assumption of thin electron beam geometry, which requires only one-dimensional dynamics of the space-charge waves, and is an exact formulation in the limit of infinitesimally thin beams. A reduced model, obtained through the application of standard time-averaging techniques, leads to an analytic expression for the parametric growth rate as a function of beam parameters, pump strength, and wave mismatch. A numerical code is developed and used to solve the unapproximated model equations, and comparisons are made with the analytic theory. Agreement is good in the domain of applicability of the theory. It is also found numerically that nonlinear steepening and associated slowing of the space-charge waves—aspects usually neglected in ponderomotive theories—have important consequences on the evolution of the instability in the strongly nonlinear regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866169
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  • 6
    Electronic Resource
    Electronic Resource
    Nonlinear magnetic field transport in opening switch plasmas (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1115-1127 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear transport of magnetic field in collisionless plasmas, as present in the plasma opening switch (POS), using the implicit multifluid simulation code anthem [J. Comput. Phys. 71, 429 (1987)] is studied. The focus is on early time behavior in the electron–magnetohydrodynamic (EMHD) limit, with the ions fixed, and the electrons streaming as a fluid under the influence of ve×B Hall forces. Through simulation, magnetic penetration and magnetic exclusion waves are characterized, due to the Hall effect in the presence of transverse density gradients, and the interaction of these Hall waves with nonlinear diffusive disturbances from electron velocity advection, (ve⋅∇)ve, is studied. It is shown how these mechanisms give rise to the anode magnetic insulation layer, central diffusion, and cathode potential hill structures seen in earlier opening switch plasmas studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860955
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  • 7
    Electronic Resource
    Electronic Resource
    Reduced magnetofluid dynamics in the lower-hybrid frequency range (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2449-2451 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electromagnetic two-fluid dynamics for plasmas in a strong applied magnetic field is investigated using a model for phenomena having frequencies in the range Ωi (very-much-less-than) ω (very-much-less-than) Ωe and long parallel wavelengths ε≡L⊥/L(parallel) (very-much-less-than) 1. The model retains the essential nonlinear physics of the magnetosonic, lower-hybrid, and oblique whistler waves. At least two unstable modes can exist for equilibria with magnetic shear; a local magnetic interchange whistler mode and a collisionless tearing mode. These modes are studied using a quadratic energy relation for linear stability and by three-dimensional time-dependent numerical computations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859616
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  • 8
    Electronic Resource
    Electronic Resource
    Small Scale Alfvénic Structure in the Aurora (2000)
    Springer
    Space science reviews 92 (2000), S. 423-533 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper presents a comprehensive review of dispersive Alfvén waves in space and laboratory plasmas. We start with linear properties of Alfvén waves and show how the inclusion of ion gyroradius, parallel electron inertia, and finite frequency effects modify the Alfvén wave properties. Detailed discussions of inertial and kinetic Alfvén waves and their polarizations as well as their relations to drift Alfvén waves are presented. Up to date observations of waves and field parameters deduced from the measurements by Freja, Fast, and other spacecraft are summarized. We also present laboratory measurements of dispersive Alfvén waves, that are of most interest to auroral physics. Electron acceleration by Alfvén waves and possible connections of dispersive Alfvén waves with ionospheric-magnetospheric resonator and global field-line resonances are also reviewed. Theoretical efforts are directed on studies of Alfvén resonance cones, generation of dispersive Alfvén waves, as well their nonlinear interactions with the background plasma and self-interaction. Such topics as the dispersive Alfvén wave ponderomotive force, density cavitation, wave modulation/filamentation, and Alfvén wave self-focusing are reviewed. The nonlinear dispersive Alfvén wave studies also include the formation of vortices and their dynamics as well as chaos in Alfvén wave turbulence. Finally, we present a rigorous evaluation of theoretical and experimental investigations and point out applications and future perspectives of auroral Alfvén wave physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005207202143
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  • 9
    Electronic Resource
    Electronic Resource
    Ueber Wasseruntersuchungen (1900)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 39 (1900), S. 727-733 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01335981
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  • 10
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    Helical instability in MagLIF due to axial flux compression by low-density plasma (2018)
    American Institute of Physics
    Details
    Publication Date: 2018-06-01
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics
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