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Fluxgate Magnetometer

NSSDCA ID: 1965-042A-02

Mission Name: IMP-C
Principal Investigator:Dr. Norman F. Ness


Each of two uniaxial fluxgate magnetometers had a dynamic range of plus or minus 40 nT and a sensitivity of plus or minus 0.25 nT. One fluxgate magnetometer failed at launch, but the other performed normally, sampling the magnetic field 30 times within each of six 4.8-s intervals every 5.46 min. Uncertainties in data were plus or minus 1.0 nT. Useful data were transmitted until May 11, 1967. A rubidium vapor magnetometer was included in the experiment package, but it produced no useful data. The instrumentation and analysis were similar to those of Explorers 18 and 21, described in J. Geophys. Res., v. 69, p. 3531, 1964, and in J. Geophys. Res., v. 72, p. 2379, 1967. 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

  • IMP-C/FluxgateMagnetometer

Facts in Brief

Mass: 1.2 kg
Power (avg): 0.6 W

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. Norman F. NessPrincipal InvestigatorNASA Goddard Space Flight Center
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