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Trapped Radiation and Solar Protons

NSSDCA ID: 1959-009A-04

Mission Name: Explorer 7
Principal Investigator:Prof. James A. Van Allen


Two omnidirectional Geiger counters (Anton 302 and 112) were used to conduct a comprehensive spatial and temporal monitoring of total cosmic-ray intensity, geomagnetically trapped corpuscular radiation, and solar protons. The detector was sensitive to protons (E>20 MeV) and electrons (E>30 keV). The experiment operated satisfactorily from launch until February 28, 1961, except for a brief period in September and October 1960.

Alternate Names

  • Explorer7/TrappedRadiationandSolarProtons


  • Space Physics: Magnetospheric Studies
  • Space Physics: Heliospheric Studies

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. George H. LudwigOther InvestigatorNOAA Environmental Research Laboratories
Prof. Louis A. FrankOther InvestigatorUniversity of
Prof. James A. Van AllenPrincipal InvestigatorUniversity of Iowa
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