(4) After the data are obtained for microwave energy transmission, the balloon will be inflated for study on microwave/ionosphere interaction. The required number of experiment cycles is at least 30, and 90 at maximum, which corresponds to approximately four and twelve hours of operation time if it is continuously operated. Space Experiment with Particle Accelerators (SEPAC) Space Experiment with Particle Accelerators (SEPAC) intends to perform active and interactive experiments on and in the earth's ionosphere and magnetosphere. A SEPAC experiment was carried out during Space Shuttle Spacelab-1 mission in 1983. Upgraded particle accelerators and diagnostics will be used for SEPAC on the Space Flyer Unit. Diagnostics will be also on board STS and joint observation of phenomena induced by the particle beams will be planned. SEPAC experiment will give insight into the complex physical processes in the magnetosphere and solar-terrestrial linkage. It is also intended to trace the magnetic field configuration of the magnetosphere and to detect the field aligned electric field.
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