Magnetic variation generated by a tangential magnetic dipole located in the Earth's core |
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Authors: | Milan Hvo?dara Igor Tunyi Reviewer A Janá?ková |
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Institution: | (1) Geophysical Institute, Slovak Acad. Sci., Bratislava |
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Abstract: | Summary The harmonically variable magnetic field, generated by a tangential magnetic dipole (TMD), located eccentrically at the surface of the Earth's core, is investigated for various periods of time variations and for a three-layer conductivity model of the Earth. Numerical computations have shown that the field is inductively damped for variation periods of less than 500 years as compared to the field of a static TMD. It is proved that the field appropriate to the TMD, has a more complicated distribution of the Earth's surface than the field of a radial magnetic dipole. Comparison with maps of the non-dipole part of the geomagnetic field shows that the TMD is not as suitable for interpreting the observed non-dipole field and its variations as the eccentric radial magnetic dipole. |
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