The US-Japan collaborative radio science experiment at the Voyager-Neptune encounter was successfully carried out on August 25,1989. The 64-meter tracking antenna at Usuda station, together with the NASA 70 meter antenna at Canberra and the Australian Parkes astronomical observatory, exibited their full capabilities and the structure of the Neptune atomosphere, its ionosphere, Triton's atmoshpere and ionosphere have been revealed for the first time.
VOYAGER 海王星最接近電波科学日米共同実験
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