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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 7
Ann. Geophys., 21, 1497–1507, 2003
https://doi.org/10.5194/angeo-21-1497-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 21, 1497–1507, 2003
https://doi.org/10.5194/angeo-21-1497-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Jul 2003

31 Jul 2003

Bi-directional electrons in the near-Earth plasma sheet

K. Shiokawa1, W. Baumjohann2, and G. Paschmann3 K. Shiokawa et al.
  • 1Solar-Terrestrial Environment Laboratory, Nagoya University, Toyokawa 442-8507, Japan
  • 2Institut für Weltraumforschung der Österreichischen Akademie der Wissenschaften, 8042 Graz, Austria
  • 3Max-Planck-Institut für extraterrestrische Physik, 85740 Garching, Germany

Abstract. 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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