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Tri-Axis Magnetometer

NSSDCA ID: 1965-043A-04

Mission Name: Gemini 4
Principal Investigator:Mr. William D. Womack


A triaxial fluxgate magnetometer was designed to determine the magnitude and direction of the local geomagnetic field with respect to the spacecraft. The data, accumulated only during passes through the South Atlantic anomaly regions, were necessary for interpretation of spectrometer and charged particle experiments on this and later Gemini flights. The magnetometer consisted of separate electrons and sensor units. The sensor unit, which was extended from the spacecraft after orbit insertion, contained three orthogonal monaxial second-harmonic probes that measured a plus or minus 0.6-gauss magnetic field with a 0- to 5-v output. The electronics unit drove the sensor, detected the vector magnetic field sensor signals, and converted the signals to analog DC voltages. Although the spacecraft was not magnetically clean and stray fields existed owing to spacecraft structure, data could be reduced. The experiment was considered a success.

Alternate Names

  • Gemini4/Tri-AxisMagnetometer


  • Space Physics: Magnetospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Mr. William D. WomackPrincipal InvestigatorNASA Johnson Space Center
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