科学衛星「あけぼの」による磁場観測の高精度データ解析法

概要

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The Japanese scientific satellite, Akebono (EXOS-D) was launched on February 22,1989,for the exploration of the auroral particle acceleration region, the polar cap and the plasmasphere. The Akebono satellite carries a triaxial fluxgate magnetometer with sensors mounted on a 5-m rigid mast. The triaxial components of magnetic field are obtained with 32-Hz sampling rate and sensitivity of 0.1 nT/digit (16-bit resolution). For deriving perturbation magnetic field from raw data, a high speed primary analysis system and a high accurate secondary data analysis method were developed. Using spacecraft attitude and orbit data, angles between X, Y and Z sensor axes, difference of the spin direction between in the spacecraft coordinate system and in the sensor coordinate system, and the sensor sensitivities were accurately determined. By correcting residual sensor offset, some fine structures of perturbation magnetic field were detected. It is clearly demonstrated that these analysis methods are very useful for the accurate derivation of perturbation magnetic field from spacecraft magnetometer data.
東海大学の論文