Two distinct energetic electron populations of different origin in the Earth's magnetotail: a Cluster case study

Energetic electrons (E≥30 keV) travelling along and perpendicular to the magnetic field\udlines 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\udelectron distributions of the full unit sphere obtained from the IES/RAPID sensor system demonstrated a rather complicated and random behavior of the\udenergetic electrons. Occasionally these electrons were appearing to travel parallel, perpendicular, or in both directions, relative to the magnetic\udfield direction, forming in this way bi-directional, perpendicular-peaked, and mixed distributions. The electron enhancements occurred while the\udCluster spacecraft were on closed field lines in the central plasma sheet approaching the neutral sheet from the northern tail lobe. Magnetic field\udand energetic particle measurements have been used from geosynchronous and Cluster satellites, in order to describe the general context of the event\udand then give a possible interpretation regarding the occurrence of the electron anisotropies observed by the IES/RAPID spectrometer on board\udCluster. According to geosynchronous measurements an electron dispersionless ejection is very well correlated with a dipolar re-configuration of the\udmagnetic field. The latter fact supports the idea that electrons and, in general, particle ejections at geosynchronous altitude are directly related to\udelectric fields arising from field dipolarization caused by current disruption. Also, having as a main objective the understanding of the way 3-D\udelectron distributions are formed, we have analyzed electron energy spectra along and perpendicular to the magnetic field direction, demonstrating the\udfact that the electron population consists of two distinct components acting independently and in a random manner relative to each other. This leads\udto the conclusion that these two electron populations along and perpendicular to the field are generated at different remote locations at different\udrates. The main conclusion of the present paper is that the perpendicular-peaked electron enhancements (electrons with pitch angle around 90 degrees,\udsubjected mainly to curvature drift) observed by Cluster are produced in a remote location duskward of the satellite location, due to the longitudinal and\udtailward expansion of a current disruption region, and subsequently transported to the Cluster location by means of curvature drift. On the other\udhand, bi-directional electrons (electrons with pitch angle around 0 and 180 degrees, bouncing mainly along the field lines) are believed to be\udgenerated 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\udsection, 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\udimportance of X-line formation for the initiation of a substorm