A new parachute system (Ballute) is being investigated in order to study the lower thermosphere and mesosphere of the earth, regions left unexplored so far because conventional in-situ measurement technique can not be applied in these regions. After a ballute system is ejected from a rocket at the height of 120-130km, parachute of the system is forced to inflate. It, however, still gains the falling velocity down to 85km and then gradually the velocity decreases. In order to have maximum falling velocity of less than 500m/sec, the total weight of the system is required to be less than 5kg, which includes a telemetry system, battery and scientific instruments. Depending on the experiment, we might be able to increase the weight up to 10kg. Part of the system is conductive so that it is used as a counter electrode for the plasma measurements and also it can be used as a reflector of electromagnetic wave for radar tracking.
熱圏下部及び中間圏探査用バルートシステム : 新しい観測手段の提案
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