ASSOCIATION OF WAVES WITH NARROW PARTICLE DROPOUTS IN THE OUTER RADIATION BELT

An investigation has been made of the association of plasma waves with narrow dropouts (<30-min observation time) in the fluxes of trapped e nergetic electrons and protons within the radiation belts. The experim ent, conducted with instruments on the CRRES satellite, indicates that 5 Hz < frequency < 1 kHz waves are nearly always produced at the time s and positions of narrow energetic electron flux dropouts. The waves may be produced at the positions of steep particle flux gradients, Thi s phenomenon is best studied during short-duration events that provide measurements on both sides of a boundary in a relatively quiescent st ate. In addition to an investigation of the waves associated with narr ow dropouts the data presented here show the general correlations betw een waves and particle fluxes, particularly after new injections or pl asmapause crossings. In some cases, energetic proton dropouts also occ ur and may contribute to the generation of waves.