We present an analysis of the wave environment observed inside an inverted-V electron event at an altitude of 1700 km, occurring in the upward directed current with intensity of a few &mgr;Am-2. During the analyzed event we observed that precipitating auroral electrons (~2 keV) generate intense (40 mV/m) auroral hiss with peak power concentrated at the lower hybrid frequency flh≈fpi, and weak Langmuir waves at fpe. The low frequency turbulence observed within the event is found to be composed of a mixture of Alfv¿n waves, O+ cyclotron waves, multi-ion resonances, and ion sound waves. The LH waves appear to interact modulationally with O+ and ion sound waves. From the observed values of flh and multi-ion resonance frequencies it is possible to estimate three-ion composition of plasma with representative values of [23, 19, 58> percent for normalized number densities of [H+, He+, O+>, respectively. ¿ American Geophysical Union 1994