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Ionization Chamber

NSSDCA ID: 1966-049A-23

Mission Name: OGO 3
Principal Investigator:Dr. John R. Winckler


This experiment was designed to measure the ionization due to energetic particles. The instrumentation consisted of a 17.78-cm-diameter integrating ionization chamber with a resetting drift-type electrometer. The system was mounted on a 12-m boom extending from the main body of the spacecraft along the Y axis. The chamber responded to electrons and protons with energies greater than 0.6 and 12 MeV, respectively, and to X rays in the range 10 to 50 keV. The ionization current was measured by a vacuum tube electrometer whose output, as a function of time, was an automatically resetting sawtooth ramp voltage between 0 and 5 V. Data were telemetered in three independent forms through three digital words and one analog word, each of which was telemetered once every 1.152 s when the OGO 3 system was operating at 1 kbs. The sampling rate linearly increased with the telemetry rate. NSSDC has all the data that exist from this investigation except for data set 66-049A-23M. More details regarding experiment design may be found in Kane, S. R., "Application of an integrating type ionization chamber to measurements of radiation in space," Ph.D. Thesis, University of Minnesota, Minneapolis, September 1967 (TRF B01017).

Alternate Names

  • OGO3/IonizationChamber


  • 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. Karl A. PfitzerOther InvestigatorMcDonnell-Douglas
Dr. Roger L. ArnoldyOther InvestigatorUniversity of New
Dr. John R. WincklerPrincipal InvestigatorUniversity of Minnesota
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