On 1990 October 13 the Sussex Particle Correlator Experiment on the USAF/NASA Combined Release and Radiation Effects Satellite (CRRES) observed modulation in the onboard wave-particle correlation functions at frequencies between one third and one half of the electron gyrofrequency during the period from 14:45 UT to 15:45 UT. At this time the Iowa plasma wave experiment measured chorus emissions in the region of one third of the local electron gyrofrequency, and the Lockheed IMS-LO electron instrument observed an apparent velocity dispersion event in electrons between 770eV and 20 keV, beginning at about 15:12 UT. We describe the particle correlation technique, briefly present this event, and then describe an approach to testing the hypothesis that wave-particle interactions were responsible for the large modulation seen in the particle correlator. Recent work on the statistical analysis of such data is presented.
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We would like to acknowledge the help of Chris Paranicas and Mark Popecki in producing the wave plot used as figure l(b), and Kevin Kerns in analysing and reducing the LEPA data. NWW acknowledges the support of PPARC grant GR/J 02438 and NWW and CGM acknowledge the assistance of the USAF office of Aerospace Research under the Window on Science Programme. This paper is dedicated to the memory of Peter Christiansen.