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Measurement of Magnetic Fields

NSSDCA ID: 1971-019A-01

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


This experiment was designed to measure accurately the vector magnetic field in the interplanetary medium and in the earth's magnetosphere, magnetotail, and magnetosheath. The detector was a boom-mounted triaxial fluxgate magnetometer with four ranges: minus to plus 16, 48, 144, and 432 nT, respectively. Corresponding sensitivities were plus or minus 0.06, 0.19, 0.56, and 1.69 nT, respectively. Automatic range selection capability was included. A flipping mechanism permitted inflight calibration of the three sensor zero levels. The vector sampling rate was 12.5 samples per second. The experiment functioned normally through the spacecraft life. For further details, see D. H. Fairfield, J. Geophys. Res., v. 79, p. 1368, 1974. Hourly averaged interplanetary data also exist as part of data sets in the NSSDC supplementary data file.

Alternate Names

  • IMP-I/MeasurementofMagneticFields

Facts in Brief

Mass: 3.5 kg
Bit rate (avg): 0.053125 kbps


  • 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. Donald H. FairfieldOther InvestigatorNASA Goddard Space Flight
Mr. Joseph B. SeekOther InvestigatorNASA Goddard Space Flight Center
Dr. Norman F. NessPrincipal InvestigatorNASA Goddard Space Flight Center
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