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Instrument: MFE : Magnetic Field Experiment (Geotail)
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The objective of the MFE experiment on Geotail is to measure the magnetic field
variation of the magnetotail in the frequency below 50 Hz.

The MGF experiment consists of dual three-axis fluxgate magnetometers and a
three-axis search coil magnetometer. Triad fluxgate sensors, which utilize a
ring core geometry, are installed at the end and middle of a 6 m deployable
mast. Three search coils are mounted approximately one-half of the way out on
another 6 m boom together with search coils for the VLF wave in the PWI system.

The fluxgate magnetometers are of standard design and consist of an amplifier,
filter, phase sensitive detector, integrator, and a voltage-current convertor.
The fluxgate magnetometers operate in seven dynamic ranges to cover various
regions of the Earth's magnetosphere and the solar wind: +/-16 nT, +/-64 nT,
+/-256 nT, +/-1024 nT, +/-4096 nT, +/-16384 nT, and +/-65536 nT, and supply 16

The search coil magnetometer system consists of three sensors, preamplifier,
amplifier, filter, multiplexer, and an A/D converter. The search coil
magnetometers operate in a frequency range of 0.5 kHz to 1 kHz, and supply 128

The fluxgate magnetometer operates in both real time and record modes, while
the search coil data are used only in real time mode.

Principal Investigator:
Dr. Tsugunobu Nagai
Tokyo Institue of Technology
Earth and Planetary Sciences
Tokyo 152-8551 Japan


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Instrument Logistics
Data Rate: 3.584 kbps
Instrument Start Date: 1992-07-24
Instrument Owner: Tokyo Institute of Technology