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Langmuir Probe

NSSDCA ID: 1965-032A-02

Mission Name: BE-C
Principal Investigator:Mr. Larry H. Brace


Two cylindrical electrostatic probes of the Langmuir probe type were used. They consisted of a collector electrode extending from the central axis of a cylindrical guard ring. The guard ring extended 5 in. from the spacecraft and the probe extended 9 in. A 2-Hz sawtooth voltage of -3 to +5 V was swept to either of the probes, and the resulting current profile to the probe was telemetered. From this profile, the electron density, electron temperature, and mean ion mass were determined. This experiment performed nominally from launch until August 13, 1968, when solar cell degradation resulting from radiation prevented operation of all systems on the satellite. The probe was not operated after that time. No archival data were produced since the experiment was a back-up for the BE-B mission, which had been flown successfully.

Alternate Names

  • BE-C/LangmuirProbe
  • Electron Density


  • Space Physics: Ionospheric Studies

Additional Information

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



NameRoleOriginal AffiliationE-mail
Mr. Larry H. BracePrincipal InvestigatorNASA Goddard Space Flight Center
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