Electron-acoustic solitons and double layers in the inner magnetosphere

Abstract : The Van Allen Probes observe generally two types of electrostatic solitary waves (ESW) contributing to the broadband electrostatic wave activity in the nightside inner magnetosphere. ESW with symmetric bipolar parallel electric field are electron phase space holes. The nature of ESW with asymmetric bipolar (and almost unipolar) parallel electric field has remained puzzling. To address their nature, we consider a particular event observed by Van Allen Probes to argue that during the broadband wave activity electrons with energy above 200 eV provide the dominant contribution to the total electron density, while the density of cold electrons (below a few eV) is less than a few tenths of the total electron density. We show that velocities of the asymmetric ESW are close to velocity of electron-acoustic waves (existing due to the presence of cold and hot electrons) and follow the Korteweg-de Vries (KdV) dispersion relation derived for the observed plasma conditions (electron energy spectrum is a power law between about 100 eV and 10 keV and Maxwellian above 10 keV). The ESW spatial scales are in general agreement with the KdV theory. We interpret the asymmetric ESW in terms of electron-acoustic solitons and double layers (shocks waves).
Type de document :
Article dans une revue
Geophysical Research Letters, American Geophysical Union, 2017, 44 (10), pp.4575-4583. 〈10.1002/2017GL074026〉
Liste complète des métadonnées

Littérature citée [31 références]  Voir  Masquer  Télécharger

https://hal-insu.archives-ouvertes.fr/insu-01557414
Contributeur : Nathalie Pothier <>
Soumis le : jeudi 6 juillet 2017 - 11:11:31
Dernière modification le : jeudi 11 janvier 2018 - 06:24:16

Fichier

Vasko_et_al-2017-Geophysical_R...
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

I. Y. Vasko, O. V. Agapitov, F. S. Mozer, J. W. Bonnell, A. V. Artemyev, et al.. Electron-acoustic solitons and double layers in the inner magnetosphere. Geophysical Research Letters, American Geophysical Union, 2017, 44 (10), pp.4575-4583. 〈10.1002/2017GL074026〉. 〈insu-01557414〉

Partager

Métriques

Consultations de la notice

22

Téléchargements de fichiers

1