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Sökning: WFRF:(Stenflo Lennart) > Konferensbidrag

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  • Brodin, Gert, 1963-, et al. (författare)
  • Three-wave coupling coefficients for a magnetized plasma
  • 2012
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • The resonant interaction between three waves in a uniform magnetized plasma is reconsidered. Starting from previous kinetic expressions, that contain a general but too little used result, we are able to improve the formulas. This leads to an explicit expression for the three wave coupling coefficient which applies for arbitrary wave propagation in a magnetized Vlasov plasma.
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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 : 2008 ICTP International Workshop on the Frontiers of Modern Plasma Physics. ; 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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  • Onishchenko, O. G., et al. (författare)
  • Finite ion Larmor radius effects in magnetic curvature-driven Rayleigh-Taylor instability
  • 2011
  • Ingår i: Joint ITER-IAEA-ICTP Advanced Workshop on Fusion and Plasma Physics. - American Institute of Physics (AIP). - 978-0-7354-1041-1 ; s. 68-73
  • Konferensbidrag (övrigt vetenskapligt)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). - 978-0-7354-1041-1 ; s. 2-14
  • Konferensbidrag (övrigt vetenskapligt)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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  • Shukla, Padma Kant, et al. (författare)
  • Magnetization of plasmas
  • 2010
  • Ingår i: New Frontiers in Advanced Plasma Physics : Proceedings of the 2010 ICTP International Advanced Workshop on the Frontiers of Plasma Physics. ; s. 1-6
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Wecritically examine and evaluate several physical mechanisms that are responsiblefor the seed magnetic fields in plasmas. The plasma magnetizationis attributed to sources that foster motion of the backgroundplasma electrons against the ions. The resulting space charge electricfield and currents, in turn, are detrimental for the plasmamagnetization.
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  • Shukla, Padma K., et al. (författare)
  • Modern plasma science
  • 2005
  • Ingår i: Physica Scripta topical issue T116 : INTERNATIONAL WORKSHOP ON THEORETICAL PLASMA PHYSICS: MODERN PLASMA SCIENCE, Triest. ; s. 5
  • Konferensbidrag (refereegranskat)
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  • Resultat 1-10 av 18
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