TIME-DOMAIN, SPECTRAL FINITE-ELEMENT APPROACH TO TRANSIENT 2-D GEOMAGNETIC INDUCTION IN A SPHERICAL HETEROGENEOUS EARTH
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dc.contributor.author | Martinec Z. | |
dc.contributor.author | Everett M.E. | |
dc.contributor.author | Velímský J. | |
dc.date.accessioned | 2022-02-05T05:13:32Z | |
dc.date.available | 2022-02-05T05:13:32Z | |
dc.date.issued | 2003 | |
dc.identifier | https://elibrary.ru/item.asp?id=14102492 | |
dc.identifier.citation | Geophysical Journal International, 2003, 155, 1, 33-43 | |
dc.identifier.issn | 0956-540X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/34986 | |
dc.description.abstract | A time-domain, spectral finite-element approach is presented for computing the electromagnetic induction response of a 2-D heterogeneous conducting sphere to transient external current excitation. This method is appropriate for determining the induced spatiotemporal electromagnetic signature at satellite altitudes associated with the upper and mid-mantle conductivity heterogeneities. The new approach is based on an existing frequency-domain 2-D spectral finite-element technique modified by the implementation of a time-stepping algorithm. To validate the time-domain approach and the associated numerical code, transient responses of concentrically and eccentrically nested spheres to ring-current excitations are computed using the inverse Fourier transform of analytical and semi-analytical, frequency-domain solutions. We show that the time-domain approach is particularly appropriate when the external current excitation has a transient feature. Compared with the frequency-domain method, it may significantly reduce the computation time while maintaining the time resolution. | |
dc.subject | electrical conductivity | |
dc.subject | electromagnetic induction | |
dc.subject | explicit time differencing | |
dc.subject | linear finite elements | |
dc.subject | spherical harmonics | |
dc.title | TIME-DOMAIN, SPECTRAL FINITE-ELEMENT APPROACH TO TRANSIENT 2-D GEOMAGNETIC INDUCTION IN A SPHERICAL HETEROGENEOUS EARTH | |
dc.type | Статья |
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