The transient Dst electromagnetic induction signal at satellite altitudes for a realistic 3‐D electrical conductivity in the crust and mantle

摘要: [1] Magnetometer data from recent low-orbit satellite missions Orsted and CHAMP offer an opportunity to improve our knowledge of electrical conductivity the Earth's mantle. The forward modelling electromagnetic induction (EM) is conventionally carried out in frequency domain. We use a time-domain technique study response realistic 3-D model based on seismic tomography laboratory measurements. excited by Dst signal time evolution but simplified as spatial dipolar shape. results show measurable simulated series mid-mantle inhomogeneities. interpretation magnetic for determination mantle inhomogeneities will, however, require more precise external ionospheric magnetospheric currents. This can be obtained simultaneous measurements several satellites.