Species dependent energies in upward directed ion beams over auroral arcs as observed with FAST TEAMS

E. Möbius, L. Tang, L. M. Kistler, M. Popecki, E. J. Lund, D. Klumpar, W. Peterson, E. G. Shelley, B. Klecker, D. Hovestadt, C. W. Carlson, R. Ergun, J. P. McFadden, F. Mozer, M. Temerin, C. Cattell, R. Elphic, R. Strangeway, R. Pfaff