Home – Home – Jornals – Russian Geology and Geophysics 2023 number 4

Sources are sometimes approximated by magnetic dipoles or current loops. The usefulness of such sources is not obvious at the initial stage of the study of objects. In order to investigate them properly, study them in detail, volume magnetic field sources are needed. In this paper, they are represented by magnetized prisms. Such a model is valid due to the equivalence of current and magnetized objects. As there should be no real magnetization in the core, this property of a virtual prism to generate a magnetic field strength is referred to as virtual or effective magnetization (EM), which is determined for each prism as by solving the inverse problem via the adaptive method. The initial data for solving the inverse problem are the Z components of the vectors of the main magnetic field of the IGRF-2005 model in the geocentric coordinate system. Based on the effective magnetization and known formulas, the distribution of bulk currents, their density, and the magnetic moments of prisms of a two-layer core model is obtained. Their sum coincides with the magnetic moment of the virtual central dipole of the nucleus, but, as many scientists assumed, the central dipole is not actually distinguished. At the same time, four global inhomogeneities are identified in the core, which create the Canadian, Siberian-Asian, Australian, and negative South Atlantic global anomalies on the Earth’s surface. Based on the analysis of the obtained results, assumptions are made that the current generating the magnetic field is the movement of a positively weakly charged liquid of the core. The fluid motion is created by the rotation of the Earth and the decelerating gravitational forces of the Moon and the Sun. Arguments are given to support these assumptions. The results are illustrated in figures.