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Ann. Geophys., 24, 1931-1948, 2006
www.ann-geophys.net/24/1931/2006/
© European Geosciences Union 2006
Two distinct energetic electron populations of different origin in the Earth's magnetotail: a Cluster case study
I. I. Vogiatzis1,2, T. A. Fritz1, Q.-G. Zong1, and E. T. Sarris2
1Center for Space Physics, Department of Astronomy, Boston University, Boston, MA, USA
2Space Research Laboratory, Dept. of Electrical and Computer Engineering, Democritus University of Thrace, Xanthi, Greece
Abstract. Energetic electrons (E≥30 keV) travelling along and perpendicular to the magnetic field
lines have been observed in the magnetotail at L~17:00 and 22:00 MLT during the recovery phase of a storm-time substorm on 7 October 2002. Three-dimensional
electron distributions of the full unit sphere obtained from the IES/RAPID sensor system demonstrated a rather complicated and random behavior of the
energetic electrons. Occasionally these electrons were appearing to travel parallel, perpendicular, or in both directions, relative to the magnetic
field direction, forming in this way bi-directional, perpendicular-peaked, and mixed distributions. The electron enhancements occurred while the
Cluster spacecraft were on closed field lines in the central plasma sheet approaching the neutral sheet from the northern tail lobe. Magnetic field
and energetic particle measurements have been used from geosynchronous and Cluster satellites, in order to describe the general context of the event
and then give a possible interpretation regarding the occurrence of the electron anisotropies observed by the IES/RAPID spectrometer on board
Cluster. According to geosynchronous measurements an electron dispersionless ejection is very well correlated with a dipolar re-configuration of the
magnetic field. The latter fact supports the idea that electrons and, in general, particle ejections at geosynchronous altitude are directly related to
electric fields arising from field dipolarization caused by current disruption. Also, having as a main objective the understanding of the way 3-D
electron distributions are formed, we have analyzed electron energy spectra along and perpendicular to the magnetic field direction, demonstrating the
fact that the electron population consists of two distinct components acting independently and in a random manner relative to each other. This leads
to the conclusion that these two electron populations along and perpendicular to the field are generated at different remote locations at different
rates. The main conclusion of the present paper is that the perpendicular-peaked electron enhancements (electrons with pitch angle around 90 degrees,
subjected mainly to curvature drift) observed by Cluster are produced in a remote location duskward of the satellite location, due to the longitudinal and
tailward expansion of a current disruption region, and subsequently transported to the Cluster location by means of curvature drift. On the other
hand, bi-directional electrons (electrons with pitch angle around 0 and 180 degrees, bouncing mainly along the field lines) are believed to be
generated in the vicinity of the neutral sheet or around an X-type region, as suggested by a plethora of previous studies. Finally, in the Discussion
section, we make an attempt to present in a more thorough way the substorm model developed by Vogiatzis et al. (2005), which is intimately related to the
importance of X-line formation for the initiation of a substorm.
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