Beam-plasma interaction experiment has been made in the magnetosphere by emitting an electron beam (100-200eV, 0.25-1.0mA) from the satellite "JIKIKEN" (EXOS -B). Various types of wave emissions are detected by a LF and HF wave detector. Two waves near at upper-hybrid frequency and at electron cyclotron frequency are detected in a low L-value region. In a higher L-value region, a harmonic generation of 16kHz is conspicuous, which is originated from the cathode heater power supply. The time variation and dependence on various parameters of the magnetosphere are studied.

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The Unmanned Space Experiment Recovery System (USERS) Project has been completed with full success, and the Service Module (SEM) of the USERS Spacecraft, which supported the recovery portion of the spacecraft which was left on the orbit, was properly disposed to the maximum extent as possible according to the IADC debris mitigation guideline and re-entered the atmosphere on June 15, 2007 (JST). USERS spacecraft disposition by possible means available at the mission completion showed good example of realizing debris mitigation purpose in spite of originally different design baseline, and obtained actual data and experiences to be reflected for future space programs.