This paper describes and discusses the preprocessing and calibration of the magnetic data taken by the navigational magnetometers onboard the two GRACE satellites, with focus on the almost 10 years period from January 2008 to the end of the GRACE mission in October 2017 for which 1-Hz magnetic data are available. A calibration of the magnetic data is performed by comparing the raw magnetometer sensor readings with model magnetic vector values as provided by the CHAOS-7 geomagnetic field model for the time and position of the GRACE data. The presented approach also accounts for magnetic disturbances produced by the satellite’s magnetorquer and for temperature effects, which are parametrized by the Sun incident angle. The root-mean-squared error of the difference between the calibrated data and CHAOS-7 model values is about 10 nT, which makes the GRACE magnetometer data relevant for geophysical investigations.

本文描述并讨论了两颗GRACE卫星上的导航磁力计所采集的磁数据的预处理和校准，重点是从2008年1月到2017年10月GRACE任务结束的近10年时间，其中1-Hz磁性数据可用。通过将原始磁力计传感器的读数与CHAOS-7地磁场模型为GRACE数据的时间和位置提供的模型磁矢量值进行比较，可以对磁数据进行校准。提出的方法还考虑了卫星磁矩产生的磁干扰和温度影响，这些影响由太阳入射角来确定。校准数据和CHAOS-7模型值之间的差异的均方根误差约为10 nT，