Evidence for wave coupling in type III emissions - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research Space Physics Année : 2009

Evidence for wave coupling in type III emissions

Résumé

Using new capabilities of waveform analyses provided by the S/WAVES instruments onboard the two STEREO spacecraft, we present for the first time a complete set of direct evidence for three-wave coupling occurring during a type III emission and involving two Langmuir waves and an ion acoustic wave. Information on the Doppler-shifted frequencies and especially the phases of the waves are used in order to check first the conservation of momentum and energy, through Fourier analyses, and second the phase locking between the waves, through bicoherence analyses. Wavelet analyses allow us to resolve for the first time the coupling regions, in which spatial length is estimated to be 18 +/- 5 km. The wave packets travel at comparable speed, and the characteristic available interaction time is about 1 s. Interpretations of the phase coupling and evaluation of the growth rate of the waves tend to favor the parametric decay, at least in the observational events considered in this work.
Fichier principal
Vignette du fichier
Journal of Geophysical Research Space Physics - 2009 - Henri - Evidence for wave coupling in type III emissions.pdf (3.14 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03786533 , version 1 (23-09-2022)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

Pierre Henri, Carine Briand, André Mangeney, Stuart D. Bale, Francesco Califano, et al.. Evidence for wave coupling in type III emissions. Journal of Geophysical Research Space Physics, 2009, 114, pp.03103. ⟨10.1029/2008JA013738⟩. ⟨hal-03786533⟩
26 Consultations
18 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More