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Article Dans Une Revue Nonlinear Processes in Geophysics Année : 2009

Alfvén wave filamentation and dispersive phase mixing in a high-density channel: Landau fluid and hybrid simulation

Résumé

The propagation of dispersive Alfvén waves in a low-beta collisionless plasma with a high-density channel aligned with the ambient magnetic field, is studied in three space dimensions. A fluid model retaining linear Landau damping and finite Larmor radius corrections is used, together with a hybrid particle-in-cell simulation aimed to validate the predictions of this Landau-fluid model. It is shown that when the density enhancement is moderate (depending on the pump wavelength and the plasma parameters), the wave energy concentrates into a filament whose transverse size is prescribed by the dimension of the channel. In contrast , in the case of a stronger density perturbation, the early formation of a magnetic filament is followed by the onset of thin helical ribbons and the development of strong gradients. This "dispersive phase mixing" provides a mechanism permitting dissipation processes (not included in the present model) to act and heat the plasma.
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Dates et versions

hal-00387937 , version 1 (30-10-2020)

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Paternité - Pas de modifications

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D. Borgogno, P. Hellinger, T. Passot, P.L. Sulem, P.M. Trávnícek. Alfvén wave filamentation and dispersive phase mixing in a high-density channel: Landau fluid and hybrid simulation. Nonlinear Processes in Geophysics, 2009, 16 (2), pp.275-285. ⟨10.5194/npg-16-275-2009⟩. ⟨hal-00387937⟩
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