Description : IMP 8 (Explorer 50) is the last satellite of the IMP series. Instrumented for interplanetary and magnetotail studies of cosmic rays, energetic solar particles, plasma, and electric and magnetic fields. The spacecraft was in the solar wind for 7 to 8 days of every 12.5 day orbit. Telemetry coverage was 90% in the early years, but only 60-70% through most of the 1980`s and early 1990`s. Coverage returned to the 90% range in the mid to late 1990`s. The objectives of the extended IMP-8 operations were to provide solar wind parameters as input for magnetospheric studies and as a 1-AU baseline for deep space studies, and to continue solar cycle variation studies with a single set of well-calibrated and understood instruments. In October, 2001, IMP 8 was terminated as an independent mission. Telemetry acquisition resumed after about three months at Canberra only (30-50% coverage), as an adjunct to the Voyager and Ulysses missions. Last useful science data from IMP 8 was acquired on October 7, 2006.
Kennedy Space Center post stamp and Explorer 50.

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EXPLORER 50 (IMP J) (SATELLITE) · DELTA 1604