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Proportional Counter Telescope

NSSDC 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.

Funding Agency

  • NASA-Office of Space Science (United States)


  • Space Physics: Heliospheric Studies

Additional Information

Questions or 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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