The recent model of Ashour-Abdalla et al., [1991b> has proposed that the Earth's plasma sheet can be formed by chaotic acceleration in a magnetotail-like field configuration. The ion velocity distributions created by chaotic acceleration have unstable features and represent robust free energy sources for kinetic plasma waves that can modify the original distributions. In the plasma sheet boundary layer, field-aligned ion beamlets are formed which drive a host of instabilities creating a broadbanded noise spectrum and causing thermal spreading of the beamlets. In addition there is strong heating of any cold background plasma that may be present. In the central plasma sheet, ion anti-loss cone distributions are created which are unstable to very low frequency waves that saturate by filling the anti-loss cone. ¿American Geophysical Union 1991