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CONFIGURATION OF SOURCES OF EARTH’S MAGNETIC FIELD OBTAINED BY SOLVING INVERSE MAGNETOMETRY PROBLEM

V.A. Kochnev
Thursday 11 October 2018 by Libadmin2018

ABSTRACT

Sources of magnetic field are often approximated by dipoles or current loops, however
it this work they are approximated by magnetized prisms instead, which is possible due
to equivalency between magnetized objects and currents. Distribution of effective
magnetization is then obtained by solving inverse magnetometry problem using the
adaptive method of refining the unknown values based on discrepancy between initial
values and model values. Z-components of Earth’s magnetic field in IGRF-2005 model
in geocentric coordinate system are used as initial values. This allows obtaining the
distribution of volumetric currents and magnetic moments for the Earth’s core, which is
found to be significantly asymmetric, with four major anomalies, corresponding to
surface anomalies: Australian, Canadian, South-Atlantic and Siberian. Work contains
additional analysis of the model, initial values and features of the used method in
relation to obtained result. Potential source of energy maintaining the currents is
suggested, in form of tidal forces, caused by the gravitational influence of the Moon and the Sun.

Keywords: earth’s magnetic field, effective magnetization, inverse problem of
magnetometry, volumetric currents, earth’s core


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