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Sökning: swepub > Umeå universitet > Stenflo Lennart > Engelska

  • Resultat 31-40 av 163
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31.
  • Shukla, P K, et al. (författare)
  • Potential distribution around a charged dust grain in an electronegative plasma
  • 2010
  • Ingår i: JOURNAL OF PLASMA PHYSICS. - : Cambridge University Press. - 0022-3778 .- 1469-7807. ; 76, s. 673-676
  • Tidskriftsartikel (refereegranskat)abstract
    • The potential distribution around a charged dust grain in an electronegative plasma is obtained by using the appropriate dielectric susceptibilities for the Boltzmann distributed electrons and negative ions, and for the inertial positive ions that are streaming from the bulk plasma into the electronegative plasma sheath. The existence of oscillatory ion wakefields is shown. Positive ions are trapped/focused in the ion wakefields, and subsequently the negative dust particles are attracted to each other, forming ordered dust structures.
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32.
  • Shukla, P.K., et al. (författare)
  • Quantum Hall-MHD equations for a non-uniform dense magnetoplasma with electron temperature anisotropy
  • 2008
  • Ingår i: Journal of Plasma Physics. - 0022-3778 .- 1469-7807. ; 74:05, s. 575-579
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    •   Nonlinear quantum Hall-MHD equations for a warm dense magnetoplasma with an anisotropic electron pressure are derived. The nonlinear equations include the quantum force associated with electron tunneling effects. The newly found equations can be used to investigate the dense plasma stability, as well as different types of waves, instabilities, and nonlinear structures in a warm dense magnetoplasma.
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33.
  • Shukla, Padma, et al. (författare)
  • Letter: Dark and grey electromagnetic electron-cyclotron envelope solitons in an electron-positron magnetoplasma
  • 2009
  • Ingår i: Journal of Plasma Physics. - : Cambridge University Press. - 0022-3778 .- 1469-7807. ; 75:5, s. 575-580
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
    • We present an investigation of the amplitude modulation of an external magnetic field-aligned right-hand circularly polarized electromagnetic electron-cyclotron (EMEC) wave in a strongly magnetized electron-positron plasma. It is shown that the dynamics of the modulated EMEC wave packet is governed by a cubic nonlinear Schrödinger equation. The latter reveals that a modulated wave packet can propagate in the form of either a dark or a grey envelope soliton. This result could have relevance to the transport of electromagnetic wave energy over long distances via envelope solitons in the magnetospheres of pulsars and magnetars.
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34.
  • Shukla, Padma, et al. (författare)
  • Wake field generation and nonlinear evolution in a magnetized electron-positron-ion plasma
  • 2008
  • Ingår i: Physics of Plasmas. - New York : AIP Publishing. - 1070-664X .- 1089-7674. ; 15:8, s. 082305-1-082305-4
  • Tidskriftsartikel (refereegranskat)abstract
    • The nonlinear propagation of a circularly polarized electromagnetic (CPEM) wave in a strongly magnetized electron-positron-ion plasma is investigated. Two coupled equations describing the interaction between a high-frequency CPEM wave and the low-frequency electrostatic wake field are derived. It is found that the generation of the wake fields partly depends on the presence of the ion species and the external magnetic field. The wake field generation in turn leads to deceleration and frequency down conversion of the electromagnetic pulse.
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35.
  • Shvartsburg, Alexander, et al. (författare)
  • Superluminal tunneling of microwaves in smoothly varying transmission lines
  • 2008
  • Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - New York : American Physical Society through the American Institute of Physics. - 1063-651X .- 1095-3787. ; 78, s. 016601-1-016601-6
  • Tidskriftsartikel (refereegranskat)abstract
    • Tunneling of microwaves through a smooth barrier in a transmission line is considered. In contrast to standard wave barriers, we study the case where the dielectric permittivity is positive, and the barrier is caused by the inhomogeneous dielectric profile. It is found that reflectionless, superluminal tunneling can take place for waves with a finite spectral width. The consequences of these findings are discussed, and an experimental setup testing our predictions is proposed.
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36.
  • Stenflo, Lennart, et al. (författare)
  • Collisional contribution to stimulated scattering in plasmas
  • 2014
  • Ingår i: Physics Letters A. - : Elsevier. - 0375-9601 .- 1873-2429. ; 378:5-6, s. 549-550
  • Tidskriftsartikel (refereegranskat)abstract
    • The influence of collisions on stimulated Brillouin scattering in magnetized plasmas is discussed. It is shown that new effects occur when the magnitude of the electron quiver velocity exceeds the electron thermal velocity.
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37.
  • Stenflo, Lennart, et al. (författare)
  • Large amplitude circularly polarized waves in quantum plasmas
  • 2010
  • Ingår i: JOURNAL OF PLASMA PHYSICS. - : Cambridge University Press. - 0022-3778 .- 1469-7807. ; 76, s. 261-265
  • Tidskriftsartikel (refereegranskat)abstract
    • Some previous dispersion relations for large amplitude waves in plasmas are generalized so that also quantum effects are included.
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38.
  • Stenflo, Lennart, et al. (författare)
  • Nonlinear acoustic-gravity waves
  • 2009
  • Ingår i: JOURNAL OF PLASMA PHYSICS. - 0022-3778 .- 1469-7807. ; 75, s. 841-847
  • Forskningsöversikt (refereegranskat)abstract
    • Previous results on nonlinear acoustic-gravity waves are reconsidered. It turns out that the mathematical techniques used are somewhat similar to those already adopted by the plasma physics community. Consequently, a future interaction between physicists On different fields, e.g in meteorology and plasma physics, can be very fruitful.
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39.
  • Stenflo, Lennart, 1939-, et al. (författare)
  • On the parametric decay of a circularly polarized wave
  • 2011
  • Ingår i: Journal of Plasma Physics. - : Cambridge University Press. - 0022-3778 .- 1469-7807. ; 77:4, s. 431-435
  • Tidskriftsartikel (refereegranskat)abstract
    • The nonlinear decay of a circularly polarized wave is reconsidered. We deduce an explicit expression for the growth rate, and present it in a form which is significantly simpler than those of previous papers.
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40.
  • Stenflo, Lennart, 1939-, et al. (författare)
  • Parametric decay of whistler waves in electron magnetohydrodynamics
  • 2011
  • Ingår i: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 83:3, s. 035503-035503
  • Tidskriftsartikel (refereegranskat)abstract
    • The nonlinear interaction between three whistler waves is reconsidered. We argue that the squared growth rate of parametric decay instability has to be expressed in a form that is always positive.
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