Article (Scientific journals)
Whistler oscillitons revisited: the role of charge neutrality?
Verheest, F.; Cattaert, Tom; Dubinin, E. et al.
2004In Nonlinear Processes in Geophysics, 11 (4), p. 447-452
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Keywords :
ELECTRON-POSITRON PLASMAS; SOLITONS; WAVES
Abstract :
[en] When studying transverse modes propagating parallel to a static magnetic field, an apparent contradiction arises between the weakly nonlinear results obtained from the derivative nonlinear Schrodinger equation, predicting envelope solitons (where the amplitude is stationary in the wave frame, but the phase is not), and recent results for whistler oscillitons, indicating that really stationary structures of large amplitude are possible. Revisiting this problem in the fluid dynamic approach, care has been taken not to introduce charge neutrality from the outset, because this not only neglects electric stresses compared to magnetic stresses, which is reasonable, but could also imply from Poisson's equation a vanishing of the wave electric field. Nevertheless, the fixed points of the remaining equations are the same, whether charge neutrality is assumed from the outset or not, so that the solitary wave solutions at not too large amplitudes will be very similar. This is home out by numerical simulations of the solutions under the two hypotheses, showing that the lack of correspondence with the DNLS envelope solitons indicates the limitations of the reductive perturbation approach, and is not a consequence of assuming charge neutrality.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Verheest, F.
Cattaert, Tom ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Bioinformatique
Dubinin, E.
Sauer, K.
McKenzie, J. F.
Language :
English
Title :
Whistler oscillitons revisited: the role of charge neutrality?
Publication date :
2004
Journal title :
Nonlinear Processes in Geophysics
ISSN :
1023-5809
eISSN :
1607-7946
Publisher :
European Geosciences Union
Volume :
11
Issue :
4
Pages :
447-452
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 24 December 2009

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