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Sökning: swepub > Umeå universitet > Stenflo Lennart > Engelska

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1.
  • Brodin, G, et al. (författare)
  • Alfven wave interactions within the Hall-MHD description
  • 2013
  • Ingår i: Journal of Plasma Physics. - Cambridge University Press (CUP). - 0022-3778. ; 79, s. 909-911
  • Tidskriftsartikel (refereegranskat)abstract
    • We show that comparatively simple expressions for the Alfven wave coupling coefficients can be deduced from the well-known Hall-magnetohydrodynamics (MHD) model equations.
2.
  • Brodin, G., et al. (författare)
  • Large amplitude electron plasma oscillations
  • 2014
  • Ingår i: Physics Letters A. - Elsevier. - 0375-9601. ; 378:22-23, s. 1632-1635
  • Tidskriftsartikel (refereegranskat)abstract
    • We consider a cold plasma in order to find new large-amplitude wave solutions in the long-wavelength limit. Accordingly we derive two generic coupled equations which describe the energy exchange between the electrostatic and electromagnetic waves. A new kind of quasi-periodic behavior is found. Our derivations may be considered as a prerequisite to extended studies of stimulated Raman scattering for cases where the wave amplitudes are so large that standard perturbation techniques are not applicable.
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3.
  • Brodin, G., et al. (författare)
  • Nonlinear dynamics of large amplitude modes in a magnetized plasma
  • 2014
  • Ingår i: Physics of Plasmas. - 1070-664X. ; 21, s. 122301
  • Tidskriftsartikel (refereegranskat)abstract
    • We derive two equations describing the coupling between electromagnetic and electrostaticoscillations in one-dimensional geometry in a magnetized cold and non-relativistic plasma. The nonlinear interaction between the wave modes is studied numerically. The effects of the external magnetic field strength and the initial electromagneticpolarization are of particular interest here. New results can, thus, be identified.
4.
  • Brodin, G., et al. (författare)
  • Nonlinear wave interactions of kinetic sound waves
  • 2015
  • Ingår i: Annales Geophysicae. - COPERNICUS GESELLSCHAFT MBH. - 0992-7689. ; 33:8, s. 1007-1010
  • Tidskriftsartikel (refereegranskat)abstract
    • We reconsider the nonlinear resonant interaction between three electrostatic waves in a magnetized plasma. The general coupling coefficients derived from kinetic theory are reduced here to the low-frequency limit. The main contribution to the coupling coefficient we find in this way agrees with the coefficient recently presented in Annales Geophysicae. But we also deduce another contribution which sometimes can be important, and which qualitatively agrees with that of an even more recent paper. We have thus demonstrated how results derived from fluid theory can be improved and generalized by means of kinetic theory. Possible extensions of our results are outlined.
5.
  • Brodin, G, et al. (författare)
  • On the parametric decay of waves in magnetized plasmas
  • 2009
  • Ingår i: Journal of Plasma Physics. - Cambridge UK : Cambridge University Press. - 0022-3778. ; 75, s. 9-13
  • Tidskriftsartikel (övrigt vetenskapligt)abstract
    • We reconsider the theory for three-wave interactions in cold plasmas. In particular, we demonstrate that previously overlooked formulations of the general theory are highly useful when deriving concrete expressions for specific cases. We also pointout that many previous results deduced directly from the basic plasma equations contain inappropriate approximations leading to unphysical results. Finally, generalizations to more elaborate plasma models containing, for example, kinetic effects are given.
6.
  • Brodin, Gert, et al. (författare)
  • Stimulated Brillouin scattering in magnetized plasmas
  • 2013
  • Ingår i: Journal of Plasma Physics. - Cambridge University Press. - 0022-3778. ; 79:6, s. 983-986
  • Tidskriftsartikel (refereegranskat)abstract
    • Previous theory for stimulated Brillouin scattering is reconsidered and generalized. We introduce an effective ion sound velocity that turns out to be useful in describing scattering instabilities.
7.
  • Brodin, G, et al. (författare)
  • Three-wave coupling coefficients for a magnetized plasma
  • 2012
  • Ingår i: Physica Scripta. - Institute of Physics. - 0031-8949. ; 85:3, s. 035504
  • Tidskriftsartikel (refereegranskat)abstract
    • The resonant interaction between three waves in a uniform magnetized plasma is reconsidered. Starting from previous kinetic expressions, which contain a general but too little used result, we are able to improve the formulae. 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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8.
  • 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.
9.
  • Brodin, G., et al. (författare)
  • Three-wave coupling coefficients for perpendicular wave propagation in a magnetized plasma
  • 2015
  • Ingår i: Physics of Plasmas. - AMER INST PHYSICS. - 1070-664X. ; 22:10
  • Tidskriftsartikel (refereegranskat)abstract
    • The resonant interaction between three waves in a uniform magnetized plasma is reconsidered. Starting from previous kinetic expressions, we limit our investigation to waves propagating perpendicularly to the external magnetic field. It is shown that reliable results can only be obtained in the two-dimensional case, i.e., when the wave vectors have both x and y components. (C) 2015 AIP Publishing LLC.
10.
  • Brodin, Gert, et al. (författare)
  • Wave Generation in a Warm Magnetized Multi-Component Plasma
  • 2014
  • Ingår i: Contributions to Plasma Physics. - Wiley-VCH Verlag. - 0863-1042. ; 54:7, s. 623-625
  • Tidskriftsartikel (refereegranskat)abstract
    • The resonant interaction between three waves propagating perpendicularly to an external magnetic field in a plasma is considered. We present the explicit expressions for the three wave coupling coefficients of a warm multi-component plasma. The results of previous work on the generation of THz radiation by laser plasma interaction are significantly improved.
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