Very oblique whistler generation by low-energy electron streams

Didier Mourenas 1 A. V. Artemyev 2 O. V. Agapitov 3, 4 V Krasnoselskikh 2 F.S. Mozer 4
1 CEA-DAM - Centre d'Études de Limeil-Valenton
2 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
3 Taras Shevchenko National University of Kyiv
4 SSL - Space Sciences Laboratory [Berkeley]
Abstract : Whistler mode chorus waves are present throughout the Earth's outer radiation belt as well as at larger distances from our planet. While the generation mechanisms of parallel lower band chorus waves and oblique upper band chorus waves have been identified and checked in various instances, the statistically significant presence in recent satellite observations of very oblique lower band chorus waves near the resonance cone angle remains to be explained. Here we discuss two possible generation mechanisms for such waves. The first one is based on Landau resonance with sporadic very low energy (<4 keV) electron beams either injected from the plasma sheet or produced in situ. The second one relies on cyclotron resonance with low-energy electron streams, such that their velocity distribution possesses both a significant temperature anisotropy above 3–4 keV and a plateau or heavy tail in parallel velocities at lower energies encompassing simultaneous Landau resonance with the same waves. The corresponding frequency and wave normal angle distributions of the generated very oblique lower band chorus waves, as well as their frequency sweep rate, are evaluated analytically and compared with satellite observations, showing a reasonable agreement.
Type de document :
Article dans une revue
Journal of Geophysical Research : Space Physics, American Geophysical Union/Wiley, 2015, 120 (5), pp.3665-3683. 〈10.1002/2015JA021135〉
Liste complète des métadonnées
https://hal-insu.archives-ouvertes.fr/insu-01259293
Contributeur : Nathalie Pothier <>
Soumis le : mercredi 20 janvier 2016 - 11:38:39
Dernière modification le : jeudi 7 février 2019 - 17:04:51
Document(s) archivé(s) le : jeudi 21 avril 2016 - 11:10:28

Fichier

jgra51779.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

INSU | CEA | UNIV-ORLEANS | DAM | OSUC | LPC2E | PSL | OBSPM

Citation

Didier Mourenas, A. V. Artemyev, O. V. Agapitov, V Krasnoselskikh, F.S. Mozer. Very oblique whistler generation by low-energy electron streams. Journal of Geophysical Research : Space Physics, American Geophysical Union/Wiley, 2015, 120 (5), pp.3665-3683. 〈10.1002/2015JA021135〉. 〈insu-01259293〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

161

Téléchargements de fichiers

107

Contact

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