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Titel Bi-directional electrons in the near-Earth plasma sheet
VerfasserIn K. Shiokawa, W. Baumjohann, G. Paschmann
Medientyp Artikel
Sprache Englisch
ISSN 0992-7689
Digitales Dokument URL
Erschienen In: Annales Geophysicae ; 21, no. 7 ; Nr. 21, no. 7, S.1497-1507
Datensatznummer 250014657
Publikation (Nr.) Volltext-Dokument vorhandencopernicus.org/angeo-21-1497-2003.pdf
 
Zusammenfassung
We have studied the occurrence characteristics of bi-directional electron pitch angle anisotropy (enhanced flux in field-aligned directions, F^ /F|| > 1.5) at energies of 0.1–30 keV using plasma and magnetic field data from the AMPTE/IRM satellite in the near-Earth plasma sheet. The occurrence rate increases in the tailward direction from XGSM = - 9 RE to - 19 RE . The occurrence rate is also enhanced in the midnight sector, and furthermore, whenever the elevation angle of the magnetic field is large while the magnetic field intensity is small, B ~ 15 nT. From these facts, we conclude that the bi-directional electrons in the central plasma sheet are produced mainly in the vicinity of the neutral sheet and that the contribution from ionospheric electrons is minor. A high occurrence is also found after earthward high-speed ion flows, suggesting Fermi-type field-aligned electron acceleration in the neutral sheet. Occurrence characteristics of bi-directional electrons in the plasma sheet boundary layer are also discussed.

Key words. Magnetospheric physics (magnetospheric configuration and dynamics; magnetotail; plasma sheet)
 
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