NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

Langmuir Probe

NSSDCA ID: 1964-064A-02

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


Two cylindrical electrostatic probes (types of Langmuir probes) were used to measure electron density and temperature. Each consisted of a collector electrode which extended from the central axis of a cylindrical guard ring. The guard ring extended 12.7 cm from the spacecraft, and the probe extended 22.86 cm. A 2-Hz sawtooth voltage of -3 to +5 volts was swept alternately to each of the probes, and the resulting current profile to the probe was telemetered. From this profile, the electron density and temperature and mean ion mass could be determined. The experiment was operated for 22 s every 3 min while within range of any of 10 telemetry stations. This experiment performed nominally from launch until August 1968, when it was turned off.

Alternate Names

  • BE-B/LangmuirProbe

Funding Agency

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


  • 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
Dr. Nelson W. SpencerOther InvestigatorNASA Goddard Space Flight Center
Mr. Larry H. BracePrincipal InvestigatorNASA Goddard Space Flight Center
[] NASA Logo -