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The lone dedicated Soviet science mission of the year lifted off from Plesetsk aboard a Tsyklon (SL-14) booster. Intercosmos 25 was part of the APEX (Active Plasma Experiment) program to investigate the effects of streams of electrons and beams of plasma on the ionosphere and magnetosphere. The spacecraft was cylindrical, measuring 1.8 m long, 1.5 m in diameter. Eight solar panels extended in petal-like fashion from one end. It weighed about one metric ton at launch. A Czechoslovakian subsatellite, Magion 3, was deployed from Intercosmos 25 on December 28.

Alternate Names

  • Intercosmos 25
  • apex
  • 21819

Facts in Brief

Launch Date: 1991-12-18
Launch Vehicle: Tsiklon-3
Launch Site: Plesetsk, U.S.S.R
Mass: 1000 kg

Funding Agency

  • Institut Kosmicheskich Issledovaniy(Inst. of Cosmophysical Research) (U.S.S.R)


  • Space Physics

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. G. A. AvanesovProject ScientistSoviet Academy of Sciences
Prof. Victor N. OraevskyProgram
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