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Annales Geophysicae 16, 1 (1998) 25-33

Strong localized variations of the low-altitude energetic electron fluxes in the evening sector near the plasmapause

E. E. Titova 1, T. A. Yahnina 1, A. G. Yahnin 1, B. B. Gvozdevsky 1, A. A. Lyubchich 1, V. Y. Trakhtengets 2, A. G. Demekhov 2, J. L. Horwitz 3, F. Lefeuvre 4, D. Lagoutte 4, J. Manninen 5, T. Turunen 5

(1998)

Specific type of energetic electron precipitation accompanied by a sharp increase in trapped energetic electron flux are found in the data obtained from low-altitude NOAA satellites. These strongly localized variations of the trapped and precipitated energetic electron flux have been observed in the evening sector near the plasmapause during recovery phase of magnetic storms. Statistical characteristics of these structures as well as the results of comparison with proton precipitation are described. We demonstrate the spatial coincidence of localized electron precipitation with cold plasma gradient and whistler wave intensification measured on board the DE-1 and Aureol-3 satellites. A simultaneous localized sharp increase in both trapped and precipitating electron flux could be a result of significant pitch-angle isotropization of drifting electrons due to their interaction via cyclotron instability with the region of sharp increase in background plasma density.

1 :	Polar Geophysical Institute
	Murmansk Region
2 :	Insitute of Applied Physics
	Insitute of Applied Physics
3 :	University of Alabama (UA)
	University of Alabama
4 :	Laboratoire de physique et chimie de l'environnement (LPCE)
	CNRS : UMR6115 – INSU – Université d'Orléans
5 :	Geophysical Observatory
	Geophysical Observatory

Domaine

:

Planète et Univers/Océan, Atmosphère Planète et Univers/Sciences de la Terre

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Soumis le : Jeudi 1 Janvier 1998, 08:00:00

Dernière modification le : Vendredi 10 Octobre 2008, 14:14:47