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The purpose of this octahedral satellite was to monitor solar activity by measuring solar particle and x-ray fluxes. The experiments were designed to investigate physical processes occurring at the magnetopause and the mechanisms of particle acceleration. This spacecraft malfunctioned from the first day of launch due to commutator and power system problems. A very limited amount of useful data was obtained. The satellite became inoperable as of October 1972.

Alternate Names

  • PL-684F
  • R68-3
  • 03952

Facts in Brief

Launch Date: 1969-05-23
Launch Vehicle: Titan III-C
Launch Site: Vandenberg AFB, United States
Mass: 13.15 kg

Funding Agency

  • Department of Defense-Department of the Air Force (United States)


  • Space Physics
  • Solar Physics
  • Astronomy

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. J. Bernard BlakeProject ScientistAerospace
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