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Solar Wind Composition By Foil Entrapment

NSSDCA ID: 1969-059C-02

Mission Name: Apollo 11 Lunar Module / EASEP
Principal Investigator:Prof. Johannes Geiss


The purpose of the solar wind composition experiment was to determine the elemental and isotopic composition of the noble gases and other selected elements in the solar wind by measurement of particle entrapment on an exposed aluminum foil sheet. These data will help to resolve competitive theories in the fields of element synthesis, origin of the solar system, history of planetary atmospheres, and solar wind dynamics. The experiment detector consisted of an expanse of foil unrolled from a reel to face the sun vector and mounted on a support structure that was placed on the lunar surface. The experiment was deployed by the astronauts, and the foil was brought back with them to earth for analysis.

Alternate Names

  • Apollo11EASEP/SolarWindCompositionByFoilEntrapment
  • S080

Facts in Brief

Mass: 0.43 kg


  • Planetary Science: Fields and Particles
  • Space Physics: Heliospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Dr. David R. Williams



NameRoleOriginal AffiliationE-mail
Prof. Johannes GeissPrincipal InvestigatorUniversitat

Selected References

  • Geiss, J., et al., The Solar-Wind Composition experiment, in Apollo 11 Prelim. Sci. Rept., NASA SP-214, Wash., DC, 1969.
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