The Magneto-Resistive Magnetometer of BCU on the Tatiana-2 Satellite

  • Author(s): Li-Yeh Liu, Shyh-Biau Jiang, Tse-Liang Yeh, Huey-Ching Yeh, Jann-Yeng Liu, Ying-Hao Hsu, and Ji-Yi Peng
  • DOI: 10.3319/TAO.2011.11.07.01(AA)
  • Keywords: Tatiana-2, Ionosphere, Magneto-resistive magnetometer, AMR sensor, Pre-flight calibration, Field-aligned current, Taiwan

The magneto-resistive magnetometer (MRM) of the Block of Central University (BCU) payload onboard the Tatiana-2 satellite is made of anisotropic magneto-resistive (AMR) sensor chips, which have appealing features of small size (10 × 15 × 7 mm3), light weight (2 grams) and low power consumption (100 mW). The small MRM is packaged together with other instrument/subsystems of the BCU into a 1.6 kg payload box for convenient installation. In this report, we present the design, calibration, and flight data analysis of the MRM. In particular, the detailed methods of pre-flight calibrations are described. The calibrated data revealed typical patterns of the global geo-magnetic field structure and of field-aligned current (FAC) distribution in the high latitude ionosphere, though the MRM of BCU only has a resolution of 24 nT and a sampling rate of 2.22 Hz. Moreover, the current density derived from our magnetic field measurements are about 2 and 3 μA m-2, respectively, for downward and upward FAC, which are comparable to those typically observed at auroral latitudes during a quiet geomagnetic condition.

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