1974
DOI: 10.5636/jgg.26.417
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Electromagnetic response of a conducting sphere buried in a conducting earth.

Abstract: D'YAKONOV'S (1959) general solution for the problem of induction in a conducting sphere embedded in a uniform conducting half-space by a spherically symmetric source has been evaluated numerically for the particular case of an overhead vertical magnetic dipole source. The validity of the numerical results are examined by comparing the results for several cases with analogue model measurements. Numerical results for a range of source frequencies, sphere radii, depths of burial, and conductivity contrasts of geo… Show more

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Cited by 8 publications
(5 citation statements)
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“…In general, the results shown in fig. 3 are similar to those obtained for a sphere embedded in a uniform earth for a vertical magnetic dipole directly above the sphere (Ogunade et al 1974 Ex I&R. The main difference in the behaviour of the anomaly H,/H,R for the buried horizontal cylinder (for a uniform inducing field) and that for a buried sphere (for a vertical magnetic dipole) is that the anomaly H,/H,R tends to be negligible for points near Y/a 2 3 for a cylinder and for points somewhat beyond Y/a z 1 for a sphere. Also, the anomalies in H, /HyR and E, /H,, are still observable for ranges up to Y/a z 10 for a buried horizontal cylinder (for a uniform inducing field), while for the buried sphere in the inducing field of a vertical magnetic dipole these anomalies are not observable beyond Y/u M 2.…”
Section: Numerical Resultssupporting
confidence: 82%
See 1 more Smart Citation
“…In general, the results shown in fig. 3 are similar to those obtained for a sphere embedded in a uniform earth for a vertical magnetic dipole directly above the sphere (Ogunade et al 1974 Ex I&R. The main difference in the behaviour of the anomaly H,/H,R for the buried horizontal cylinder (for a uniform inducing field) and that for a buried sphere (for a vertical magnetic dipole) is that the anomaly H,/H,R tends to be negligible for points near Y/a 2 3 for a cylinder and for points somewhat beyond Y/a z 1 for a sphere. Also, the anomalies in H, /HyR and E, /H,, are still observable for ranges up to Y/a z 10 for a buried horizontal cylinder (for a uniform inducing field), while for the buried sphere in the inducing field of a vertical magnetic dipole these anomalies are not observable beyond Y/u M 2.…”
Section: Numerical Resultssupporting
confidence: 82%
“…1). From Maxwell's equations and equation (2) The laboratory analogue model has been described in details earlier (Doss0 1966(Doss0 , 1973Ogunade, Ramaswamy and Dosso 1974). A reasonably uniform inducing field over a sizeable area of the tank was provided by a pair of current carrying parallel wires separated by a distance of 2.4 m and situated at a height of 1.2 m above the surface of the salt solution.…”
Section: Mathematical Analysismentioning
confidence: 99%
“…The phase angles of the components of the total fields are denoted byJ 5y, cz and cb and those of the primary fields at the surface of the lower layer by b, L5zp and A similar normalization was used previously (OGUNADE et al, 1974). For the purpose of discussing the computed fields, the results given in Fig.…”
Section: Numerical Resultsmentioning
confidence: 99%
“…For all the cases computed the conductivity of the lower layer was kept constant at c2= 10-3Q-1m-1, and the overhead vertical magnetic dipole was fixed at a height of 100km above the surface of the upper layer. As in OGUNADE et al (1974), the position along the traverse is expressed in units of sphere radii, i. e., Y/a, where Y is a horizontal distance and a is the sphere radius.…”
Section: Numerical Resultsmentioning
confidence: 99%
“…The electromagnetic response of a conducting cylinder, a sphere and bodies with other shapes embedded in a less conducting medium has often been studied mostly in relation to geophysical prospecting (e.g., OGUNADE et al, 1974;HILL and WAIT, 1974). HUGHES (1973HUGHES ( , 1974aHUGHES ( , 1974b) also developed a technique of studying such responses for induction by a plane wave.…”
mentioning
confidence: 99%