This study presents results of mapping three-dimensional (3-D) variations of the electrical conductivity in depths ranging from 400 to 1200 km using 6 years of magnetic data from the Swarm and CryoSat-2 satellites as well as from ground observatories. The approach involves the 3-D inversion of matrix Q-responses (transfer functions) that relate spherical harmonic coefficients of external (inducing) and internal (induced) origin of the magnetic potential. Transfer functions were estimated from geomagnetic field variations at periods ranging from 2 to 40 days. We study the effect of different combinations of input data sets on the transfer functions. We also present a new global 1-D conductivity profile based on a joint analysis of satellite tidal signals and global magnetospheric Q-responses.

这项研究使用来自Swarm和CryoSat-2卫星以及地面观测站的6年磁数据，绘制了从400到1200 km深度的电导率的三维（3-D）变化图，并绘制了结果。该方法涉及矩阵Q响应（传递函数）的3-D反转，该响应与外部（感应）和内部（感应）势源的球谐系数相关。传递函数是根据2到40天范围内的地磁场变化估算的。我们研究了输入数据集不同组合对传递函数的影响。我们还基于对卫星潮汐信号和全球磁层Q响应的联合分析，提出了一种新的全球一维电导率曲线。