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| Titel |
Bi-directional electrons in the near-Earth plasma sheet |
| VerfasserIn |
K. Shiokawa, W. Baumjohann, G. Paschmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 21, no. 7 ; Nr. 21, no. 7, S.1497-1507 |
| Datensatznummer |
250014657
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| Publikation (Nr.) |
 copernicus.org/angeo-21-1497-2003.pdf |
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| 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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