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Sökning: WFRF:(Stenflo Lennart) > Konferensbidrag

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  • Anderson, D., et al. (författare)
  • Collapse of optical vacuum pulses due to QED nonlinearities
  • 2002
  • Ingår i: Nonlinear Guided Waves and Their Applications, 1–4 September 2002, Stresa, Italy. - : Optics Info Base, Optical Society of America. - 1557527237
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Due to quantum electrodynamical (QED) effects there are nonlinear corrections to Maxwell's equations in vacuum. We show that stationary two-dimensional light bullets can form, which are unstable and exhibit, the possibility of self-focusing collapse.
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  • Eliasson, Bengt, et al. (författare)
  • Full-Scale Numerical Modeling of Turbulent Processes in the Earth's Ionosphere
  • 2008
  • Ingår i: Frontiers in Modern Plasma Physics. - : AIP. ; , s. 197-207
  • Konferensbidrag (refereegranskat)abstract
    • We present a full-scale simulation study of ionospheric turbulence by means of a generalized Zakharov model based on the separation of variables into high-frequency and slow time scales. The model includes realistic length scales of the ionospheric profile and of the electromagnetic and electrostatic fields, and uses ionospheric plasma parameters relevant for high-latitude radio facilities such as Eiscat and HAARP. A nested grid numerical method has been developed to resolve the different length-scales, while avoiding severe restrictions on the time step. The simulation demonstrates the parametric decay of the ordinary mode into Langmuir and ion-acoustic waves, followed by a Langmuir wave collapse and short-scale caviton formation, as observed in ionospheric heating experiments.
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  • Karimov, A. R., et al. (författare)
  • The processes of nonequilibrium exchange in rotating plasma flows
  • 2016
  • Ingår i: II CONFERENCE ON PLASMA & LASER RESEARCH AND TECHNOLOGIES. - : IOP Publishing.
  • Konferensbidrag (refereegranskat)abstract
    • The mechanisms of energy/momentum exchange in rotating and compressing plasma flows have been discussed. It has been shown that such flows are capable of transforming the energy of different degrees of freedom into the energy of one degree owing to the interaction of the coupled nonlinear radial, axial and azimuthal electron-ion oscillations. These processes may lead to the additional acceleration of the flow in azimuthal or axial direction so they might be instrumental for the creation of space thrusters employing pulse transformations for propulsion.
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  • Onishchenko, O. G., et al. (författare)
  • Finite ion Larmor radius effects in magnetic curvature-driven Rayleigh-Taylor instability
  • 2011
  • Ingår i: AIP Conference Proceeding Joint ITER-IAEA-ICTP Advanced Workshop on Fusion and Plasma Physics. - : American Institute of Physics (AIP). - 9780735410411 ; , s. 68-73
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Incomplete finite ion Larmor radius stabilization of the magnetic Rayleigh-Taylor (RT)instability is investigated. In contrast to the previous studies the effects of both the gravity and magnetic field curvature are taken into account. New model hydrodynamic equations describing nonlinear flute waves with arbitrary spatial scales have been derived. Particular attention is paid to the waves with spatial scales of the order of the ion Larmor radius. In the linear approximation a Fourier transform of these equations yields a generalized dispersion relation for flute waves. The condition for gravity and magnetic curvature at which the instability cannot be stabilized by the finite ion Larmor radius effects is found. It is shown that in the absence of the magnetic curvature the complete stabilization arises due to the cancellation of gravitational and diamagnetic drifts. However, when the magnetic curvature drift is taken into account this synchronization is violated and the RT instability is stabilized at more complex conditions. Furthermore, the dependence of the instability growth rate on the equilibrium plasma parameters is investigated.
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  • Shukla, Padma Kant, et al. (författare)
  • Compressional Alfvénic shocks and solitary waves in plasmas
  • 2011
  • Ingår i: Joint ITER-IAEA-ICTP Advanced Workshop on Fusion and Plasma Physics. - : American Institute of Physics (AIP). - 9780735410411 ; , s. 2-14
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • We present a review of recent results for compressional Alfvénic shocks and solitary waves in electron-ion and electron-positron plasmas, which are governed by the two-fluid equations, coupled with Faraday's and Ampère's laws. We consider large amplitude compressional Alfvénic shock waves and solitary pulses in a warm collisional electron-ion (e-i) magnetoplasma, and large amplitude compressional Alfvénic solitary pulses in magnetized e-i and electron-positron (e-p) plasmas. These nonlinear structures can exist in well defined speed ranges above the Alfvén speed. They can be associated with localized electromagnetic field excitations in magnetized laboratory and space plasmas that are composed of electrons, ions, and/or positrons.
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  • Resultat 1-10 av 20

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