Magnetic variations excited by a radial 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 Theoretical formulae are derived for computing a variable magnetic field, excited by a harmonically oscillating radial magnetic dipole (RMD), located eccentrically at the surface of the Earth's core. By numerical computations, using a three-layered conductivity model of the Earth, it is proved that the field due to this source, computed for the surface of the Earth, is relatively weak in comparison to the field of a stationary magnetic dipole, provided the period of the changes is less than 500 years. The  zone of influence of the RMD at the Earth's surface is also determined and on its basis a number of conclusions were drawn with respect to representing the non-dipole part of the geomagnetic field by means of the RMD system in the Earth's core.Dedicated to RNDr. Jan Pícha, CSc., on his 60th Birthday |
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