Interferometric identification of ion acoustic broadband waves in the auroral region: CLUSTER observations

M. Backrud 1 A. Tjulin 2 A. Vaivads 1 M. André 1 A. Fazakerley 3
1 IRF - Swedish Institute of Space Physics [Uppsala]
2 LPCE - Laboratoire de physique et chimie de l'environnement
3 MSSL - Mullard Space Science Laboratory
Abstract : We determine the phase velocity and k vector for parallel and oblique broadband extremely low frequency, ELF, waves on nightside auroral magnetic field lines at altitudes around 4.6 R E. We use internal burst mode data from the EFW electric field and wave instrument onboard the Cluster spacecraft to retrieve phase differences between the four probes of the instrument. The retrieved characteristic phase velocity is of the order of the ion acoustic speed and larger than the thermal velocity of the protons. The typical wavelength obtained from interferometry is around the proton gyro radius and always larger than the Debye length. We find that in regions with essentially no suprathermal electrons above a few tens of eV the observed broadband waves above the proton gyro frequency are consistent with upgoing ion acoustic and oblique ion acoustic waves.
Type de document :
Article dans une revue
Geophysical Research Letters, American Geophysical Union, 2005, 32 (21), pp.L21109. 〈10.1029/2005GL022640〉
Liste complète des métadonnées

Littérature citée [14 références]  Voir  Masquer  Télécharger
https://hal-insu.archives-ouvertes.fr/insu-01556705
Contributeur : Nathalie Pothier <>
Soumis le : mercredi 5 juillet 2017 - 14:14:18
Dernière modification le : mardi 29 mai 2018 - 12:50:35
Document(s) archivé(s) le : mardi 23 janvier 2018 - 20:20:53

Fichier

Backrud_et_al-2005-Geophysical...
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

INSU | LPC2E | OSUC | UNIV-ORLEANS

Citation

M. Backrud, A. Tjulin, A. Vaivads, M. André, A. Fazakerley. Interferometric identification of ion acoustic broadband waves in the auroral region: CLUSTER observations. Geophysical Research Letters, American Geophysical Union, 2005, 32 (21), pp.L21109. 〈10.1029/2005GL022640〉. 〈insu-01556705〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

82

Téléchargements de fichiers

36

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD