Beschreibung : The purpose of the AE-D mission was to continue the investigation begun by AE-C of the chemical processes and energy transfer mechanisms that control the structure and behavior of the earth`s atmosphere and ionosphere in the region of high absorption of solar energy. This mission was planned to sample the high latitude regions at the same time that the AE-E mission was sampling the equatorial and low latitude regions.
Unfortunately, a failure in the solar power panels resulted in the termination of operations on January 29, 1976, after slightly less than 4 months of useful life.
Vandenberg post stamp and Explorer 54 satellite.

USA 812 - picture enhanced ?

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Weltraumereignis :

EXPLORER 54 (AE D) (SATELLITE) · DELTA 2910