Lm. Kistler et al., FAST TEAMS OBSERVATIONS OF CHARGE-EXCHANGE SIGNATURES IN IONS MIRRORING AT LOW ALTITUDES/, Geophysical research letters, 25(12), 1998, pp. 2085-2088
Using the TEAMS instrument on FAST, we have observed a case in which s
ignatures of the inner edge of the plasma sheet are clearly observed i
n the energy spectra of ions mirroring at the FAST altitude. That inne
r edge is dominated by He+. We show that this is the natural compositi
on expected from charge exchange as the ions drift in from the plasma
sheet.