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Alfvén wave filamentation and dispersive phase mixing in a high-density channel: Landau fluid and hybrid simulations
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SYSNO ASEP 0327359 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Alfvén wave filamentation and dispersive phase mixing in a high-density channel: Landau fluid and hybrid simulations Title Filamentace a dispersivní fázové mixování Alfvénových vln kanálu zvýšené hustoty Author(s) Borgogno, D. (FR)
Hellinger, Petr (ASU-R) RID, ORCID
Passot, T. (FR)
Sulem, P. L. (FR)
Trávníček, Pavel M. (UFA-U) RID, ORCIDNumber of authors 5 Source Title Nonlinear Processes in Geophysics - ISSN 1023-5809
Roč. 16, č. 2 (2009), s. 275-285Number of pages 11 s. Publication form web - web Language eng - English Country DE - Germany Keywords Alfven wave ; phase mixing ; filamentation Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects IAA300420702 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) AV0Z10030501 - ASU-R (2005-2011) UT WOS 000265743500011 Annotation The propagation of dispersive Alfven 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. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2010
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