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Dynamics Explorer
Dynamics Explorer was a NASA mission, launched on August 3, 1981 and terminated on February 28, 1991.〔(DE (Dynamics Explorer) )〕 It consisted of two unmanned satellites, DE-1 and DE-2, whose purpose was to investigate the interractions between plasmas in the magnetosphere and those in the ionosphere.〔(NSSDC Master Catalog )〕 The two satellites were launched together into polar coplanar orbits, which allowed them to simultaneously observe the upper and lower parts of the atmosphere.
==Design==
Both spacecraft had a polygonal shape, and were approximately 137 cm in diameter and 115 cm high. Each also had a 200-cm radio antenna and two 6-meter booms which were needed to distance some of the equipment from the main body of the spacecraft. They were stacked on top of each other and launched aboard a Delta 3000 booster rocket. Upon reaching orbit, the two spacecraft departed from the booster and entered separate orbits. Dynamics Explorer 1 was placed into a high altitude elliptical orbit, while DE-2 was put into a lower orbit that was also more circular.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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