DETAILED OBSERVATIONS OF A BURST OF ENERGETIC PARTICLES IN THE DEEP MAGNETOTAIL BY GEOTAIL

Using data from the energetic particle detector on board the GEOTAIL s atellite we report on a case study of electron and ion bursts observed at X(GSM) = -128R(E). Based on the arrival times of energetic electro ns, protons, Helium and Oxygen, as well as the time of flight channels designed specifically for remote sensing purposes, we estimate that t he particle acceleration took place at X(GSM) congruent to -103R(E). T he ensuing tailward particle anisotropy gives a bulk flow estimate tha t is consistent with the arrival time of the plasma from the expected location of the acceleration region.