Evidence from the S3-3 satellite indicates that parallel electric fields occur above 5,000 km altitude where electron drift velocity is highest for a current carrying plasma. Electrostatic ion cyclotron (EIC) turbulence is also observed in this altitude range. Previous models of current-supported potential drops have neglected the role of turbulence. Large amplitude Alfv¿n waves can carry a current which drives the electrostatic ion cyclotron (EIC) mode unstable above 5,000 km. Anomalous resistivity associated with coherent EIC waves can support parallel electric fields in excess of 1 mV/m and may set up particle populations necessary to support oblique electrostatic shocks.