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GSFC Magnetometer

NSSDCA ID: 1967-070A-04

Mission Name: Explorer 35
Principal Investigator:Dr. Norman F. Ness


The experiment consisted of a boom-mounted triaxial fluxgate magnetometer. Each sensor had dual ranges of minus to plus 24 nT and 64 nT, with digitization resolutions of minus to plus 0.094 nT and 0.25 nT, respectively. Zero level drift was checked by periodic reorientation of the sensors until May 20, 1969, when the flipper mechanism failed. Past this point, data analysis was more difficult as the zero level drift of the sensor parallel to the spacecraft spin axis was not readily determined. Spacecraft interference was less than 0.125 nT. One vector measurement was obtained each 5.12 s. The bandpass of the magnetometer was 0 to 5 Hz, with a 20-dB per decade decrease for higher frequencies. Except for the flipper failure, the experiment functioned normally from launch to spacecraft turnoff (June 24, 1973). For further details, see Ness et al., J. Geophys. Res., v. 72, p. 5769, 1969. NSSDC has all the useful data that exist from this investigation. Hourly averaged interplanetary data also exist as part of data sets in the NSSDC supplementary data file.

Alternate Names

  • Explorer35/GSFCMagnetometer
  • Triaxial Fluxgate Magnetometer

Facts in Brief

Power (avg): 1 W
Bit rate (avg): 0.0047 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. Kenneth W. BehannonOther InvestigatorNASA Goddard Space Flight Center
Dr. Norman F. NessPrincipal InvestigatorNASA Goddard Space Flight Center
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