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  • Bingham, Robert, et al. (författare)
  • Ion acceleration by Alfven waves on auroral field lines
  • 2013
  • Ingår i: Physica Scripta. - Institute of Physics. - 0031-8949. ; 87:5
  • Tidskriftsartikel (refereegranskat)abstract
    • Observations of ion acceleration along auroral field lines at the boundary of the plasma sheet and tail lobe of the Earth show that the energy of the ions increases with decreasing density. The observations can be explained by ion acceleration through Landau resonance with kinetic Alfven waves (KAWs) such that k(A) . v(i) = omega(A), where k(A) is the wave vector, v(i) is the ion resonance velocity and omega(A) is the Alfven wave frequency. The ion resonance velocities are proportional to the Alfven velocity which increases with decreasing density. This is in agreement with the data if the process is occurring at the plasma sheet tail lobe boundary. A quasi-linear theory of ion acceleration by KAWs is presented. These ions propagate both down towards and away from the Earth. The paths of the Freja and Polar satellites indicate that the acceleration takes place between the two satellites, between 1Re and 5Re. The downward propagating ions develop a horseshoe-type of distribution which has a positive slope in the perpendicular direction. This type of distribution can produce intense lower hybrid wave activity, which is also observed. Finally, the filamentation of shear Alfven waves is considered. It may be responsible for large-scale density striations.
  • Bingham, Robert, et al. (författare)
  • Solar coronal heating by plasma waves
  • 2010
  • Ingår i: Journal of Plasma Physics. - Cambridge university. - 0022-3778. ; 76:2, s. 135-158
  • Tidskriftsartikel (refereegranskat)abstract
    • The solar coronal plasma is maintained at temperatures of millions of degrees, much hotter than the photosphere, which is at a temperature of just 6000 K. In this paper, the plasma particle heating based on the kinetic theory of wave–particle interactions involving kinetic Alfvén waves and lower-hybrid drift modes is presented. The solar coronal plasma is collisionless and therefore the heating must rely on turbulent wave heating models, such as lower-hybrid drift models at reconnection sites or the kinetic Alfvén waves. These turbulent wave modes are created by a variety of instabilities driven from below. The transition region at altitudes of about 2000 km is an important boundary chromosphere, since it separates the collision-dominated photosphere/chromosphere and the collisionless corona. The collisionless plasma of the corona is ideal for supporting kinetic wave–plasma interactions. Wave–particle interactions lead to anisotropic non-Maxwellian plasma distribution functions, which may be investigated by using spectral analysis procedures being developed at the present time.
  • 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.
  • Brodin, Gert, et al. (författare)
  • Dispersion relation for electromagnetic wave propagation in a strongly magnetized plasma
  • 2006
  • Ingår i: New Journal of Physics. - Bristol, UK : Institute of Physics Pub.. - 1367-2630. ; 8:January, s. 16
  • Tidskriftsartikel (refereegranskat)abstract
    • A dispersion relation for electromagnetic wave propagation in a strongly magnetized cold plasma is deduced, taking photon–photon scattering into account. It is shown that the combined plasma and quantum electrodynamic effect is important for understanding the mode-structures in magnetar and pulsar atmospheres. The implications of our results are discussed.
  • Brodin, Gert, et al. (författare)
  • Nonlinear interactions between three inertial Alfvén waves
  • 2007
  • Ingår i: Journal of Plasma Physics. - 0022-3778. ; 73:1, s. 9-13
  • Tidskriftsartikel (refereegranskat)abstract
    • The resonant coupling between Alfvén waves is reconsidered. New results are found for cold agnetoplasmas where temperature effects are negligible.
  • 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.
  • 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.
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