An investigation has been made of the association of plasma waves with narrow dropouts (<30-min observation time) in the fluxes of trapped energetic electrons and protons within the radiation belts. The experiment, conducted with instruments on the CRRES satellite, indicates that 5 Hz waves are nearly always produced at the times and positions of narrow energetic electron flux dropouts. The waves may be produced at the positions of steep particle flux gradients. This phenomenon is best studied during short-duration events that provide measurements on both sides of a boundary in a relatively quiescent state. In addition to an investigation of the waves associated with narrow dropouts the data presented here show the general correlations between waves and particle fluxes, particularly after new injections or plasmapause crossings. In some cases, energetic proton dropouts also occur and may contribute to the generation of waves.¿ 1997 American Geophysical Union