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Nonlinear waves in the terrestrial quasiparallel foreshock
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Hnat, Bogdan, Kolotkov, Dmitrii, O'Connell, D., Nakariakov, V. M. (Valery M.) and Rowlands, G. (George) (2016) Nonlinear waves in the terrestrial quasiparallel foreshock. Physical Review Letters, 117 (23). 235102 . doi:10.1103/PhysRevLett.117.235102 ISSN 0031-9007.
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Official URL: http://doi.org/10.1103/PhysRevLett.117.235102
Abstract
We provide strongly conclusive evidence that the cubic nonlinearity plays an important part in the evolution of the large amplitude magnetic structures in the terrestrial foreshock. Large amplitude nonlinear wave trains at frequencies above the proton cyclotron frequency are identified after nonharmonic slow variations are filtered out by applying the empirical mode decomposition. Numerical solutions of the derivative nonlinear Schrödinger equation, predicted analytically by the use of a pseudopotential approach, are found to be consistent with the observed wave forms. The approximate phase speed of these nonlinear waves, indicated by the parameters of numerical solutions, is of the order of the local Alfvén speed. We suggest that the feedback of the large amplitude fluctuations on background plasma is reflected in the evolution of the pseudopotential.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
SWORD Depositor: | Library Publications Router | ||||
Journal or Publication Title: | Physical Review Letters | ||||
Publisher: | American Physical Society | ||||
ISSN: | 0031-9007 | ||||
Official Date: | 2 December 2016 | ||||
Dates: |
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Volume: | 117 | ||||
Number: | 23 | ||||
Article Number: | 235102 | ||||
DOI: | 10.1103/PhysRevLett.117.235102 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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