PRELIMINARY-RESULTS FROM THE MEMO MULTICOMPONENT MEASUREMENTS OF WAVES ON-BOARD INTERBALL-2

The MEMO (MEsure Multicomposante des Ondes) experiment is a part of th e INTERBALL2 wave consortium. It is connected to a total of six electr ic and nine magnetic independent sensors. It provides waveforms associ ated with the measurement of two to five components in three frequency bands: ELF (5-1000 Hz), VLF (1-20 kHz), LF (20-250 kHz). Preliminary analyses of low and high resolution data are presented. The emphasis i s put on the estimation of the propagation characteristics of the obse rved waves. VLF hiss emissions are shown to be mainly whistler mode em issions, but other modes are present. An accurate estimation of the lo cal plasma frequency is proposed when the low L = 0 cutoff frequency i s identified. AKR emissions observed just above source regions are stu died. R-X and L-O modes are found: the first at the lowest frequencies and the second at the highest. Both propagate with wave normal direct ions weakly oblique or quasi-parallel to the Earth's magnetic field di rection. Propagation characteristics are also determined for a (non-dr ifting) fine structure of AKR. There is no fundamental difference with structurless events. Nightside and dayside bursts of ELF electromagne tic emissions are presented. It is not clear whether the two emissions belong to the ''lion roar'' emissions or not.