Quasi-monochromatic waves at ~ 1.2 f cH, where f cH is the hydrogen cyclotron frequency, were observed as the ISEE 1 satellite traversed auroral field lines at radial distances of ~2.5--4.5 RE near midnight on June 19, 1981. The waves were polarized perpendicular to the magnetic field (k∥/k⊥≲0.2). In addition, there were waves at slightly above both the helium and the oxygen cyclotron frequencies. The waves occurred within a region of reduced density (~0.1--0.2/cm3) with the electron temperature greater than the ion temperature, upflowing hydrogen and oxygen beams, and weak field-aligned currents bounded by electrostatic shocks. The wave characteristics and associations were similar to those observed at lower altitudes by the S3-3 satellite. Comparisons were made between the observed H+ and O+ beams, field-aligned currents, densities and temperatures, and linear theories of electrostatic ion cyclotron waves and H+-O+ two-stream instabilities. The features of the observed waves are most consistent with the current-driven mode. In addition, numerical studies of the linear dispersion relation, using parameters based on the observations, showed tht both the parallel and oblique two-stream modes and the ion-beam driven modes were stable while oblique current driven modes were unstable. The O+ and H+ distributions provide evidence for interactions with local electrostatic ion cyclotron waves and for the H+--O+ two-stream instability at altitudes below the satellite. ¿American Geophysical Union 1991