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Ionization Chamber

NSSDCA ID: 1964-054A-20

Mission Name: OGO 1
Principal Investigator:Dr. John R. Winckler


This experiment, designed to measure the ionization due to energetic particles, consisted of a 17.78-cm integrating ionization chamber with a resetting drift-type electrometer. The system was mounted on a 1.2-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 10- to 50-keV X rays. 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 system was operating at 1 kbs. The sampling rate linearly increased with the telemetry rate. 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, Minn., September 1967 (TRF B01017). NSSDC has all the data that exist, except for data set 64-054A-20L.

Alternate Names

  • OGO1/IonizationChamber

Facts in Brief

Mass: 2.3 kg
Power (avg): 0.7 W
Bit rate (avg): 8 kbps

Funding Agency

  • NASA-Office of Space Science Applications (United States)


  • 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. Roger L. ArnoldyOther InvestigatorUniversity of New
Dr. Sharad R. KaneOther InvestigatorUniversity of California,
Dr. John R. WincklerPrincipal InvestigatorUniversity of Minnesota
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