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Proportional Counter Telescope

NSSDCA ID: 1960-001A-01

Mission Name: Pioneer 5
Principal Investigator:Dr. John A. Simpson


A triple coincidence omnidirectional proportional counter telescope was used to observe terrestrial trapped radiation and solar particles (protons E>75 MeV, electrons E>13 MeV). Measurements were obtained for about 2 months during which a week of quiescent magnetic field conditions followed by two geomagnetic storms closely spaced in time occurred. The date of transmission of the last useful information was May 16, 1960.

Alternate Names

  • Pioneer5/ProportionalCounterTelescope

Funding Agency

  • NASA-Office of Space Science (United States)


  • 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. Charles Y. FanOther InvestigatorUniversity of Arizona
Prof. Peter MeyerOther InvestigatorUniversity of Chicago
Dr. John A. SimpsonPrincipal InvestigatorUniversity of Chicago
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