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AMES Magnetic Fields

NSSDCA ID: 1967-070A-03

Mission Name: Explorer 35
Principal Investigator:Dr. Charles P. Sonett


The Ames magnetometer experiment consisted of a boom-mounted triaxial fluxgate magnetometer and an electronics package. The sensors were orthogonally mounted, with one sensor oriented along the spin axis of the spacecraft. A motor interchanged a sensor in the spin plane with the sensor along the spin axis every 24 h, allowing inflight calibration. The instrument package included a circuit for demodulating the outputs from the sensors in the spin plane. The noise threshold was about 0.2 nT. The instrument had three ranges covering plus or minus 20, 60, and 200 nT full scale for each vector component. The digitization accuracy for each range was 1% of the entire range covered. The magnetic field vector was measured instantaneously, and the instrument range was changed after each measurement. A period of 2.05 s elapsed between adjacent measurements and a period of 6.14 s elapsed between measurements using the same range. The instrument performance was normal. For further details, see Mihalov et al., J. Geophys. Res., v. 73, p. 943, 1968. NSSDC has all the useful data that now exist.

Alternate Names

  • Explorer35/AMESMagneticFields
  • Triaxial Fluxgate Magnetometer

Facts in Brief

Mass: 2.4 kg
Power (avg): 0.7 W


  • 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. David S. ColburnGeneral ContactNASA Ames Research Center
Mr. Richard W. SilvaOther InvestigatorTRW Systems Group
Dr. John H. WolfeOther InvestigatorNASA Ames Research Center
Dr. William J. KerwinOther InvestigatorNASA Ames Research Center
Dr. Charles P. SonettPrincipal InvestigatorUniversity of Arizona
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