THE ELECTROMAGNETIC FIELDS OF A HORIZONTAL DIPOLE IN THE PRESENCE OF A CONDUCTING HALF-SPACE

1961 ◽  
Vol 39 (7) ◽  
pp. 1017-1028 ◽  
Author(s):  
James R. Wait
Keyword(s):  
Half Space ◽  
Electromagnetic Fields ◽  
Electric Dipole ◽  
Plane Surface ◽  
Near Zone ◽  
Horizontal Electric Dipole

The problem considered is a horizontal electric dipole which is located above or below the plane surface of a conducting half-space. Expressions for the fields are obtained using three different approaches. The formulas developed are quite simple and, taken together, the whole range of distances from the far-zone to the near-zone is adequately covered.

Electromagnetic induction by a finite electric dipole source over a 2-D earth

Geophysics ◽  
1993 ◽  
Vol 58 (2) ◽  
pp. 198-214 ◽  
Author(s):  
Martyn J. Unsworth ◽  
Bryan J. Travis ◽  
Alan D. Chave
Keyword(s):  
Finite Element ◽  
Electromagnetic Fields ◽  
Electric Dipole ◽  
Numerical Solutions ◽  
Current Source ◽  
Three Dimensional ◽  
Iterative Solution ◽  
Electromagnetic Response ◽  
Dipole Source ◽  
Horizontal Electric Dipole

A numerical solution for the frequency domain electromagnetic response of a two‐dimensional (2-D) conductivity structure to excitation by a three‐dimensional (3-D) current source has been developed. The fields are Fourier transformed in the invariant conductivity direction and then expressed in a variational form. At each of a set of discrete spatial wavenumbers a finite‐element method is used to obtain a solution for the secondary electromagnetic fields. The finite element uses exponential elements to efficiently model the fields in the far‐field. In combination with an iterative solution for the along‐strike electromagnetic fields, this produces a considerable reduction in computation costs. The numerical solutions for a horizontal electric dipole are computed and shown to agree with closed form expressions and to converge with respect to the parameterization. Finally some simple examples of the electromagnetic fields produced by horizontal electric dipole sources at both the seafloor and air‐earth interface are presented to illustrate the usefulness of the code.

Identity of solutions for a horizontal electric dipole in a conducting half-space

1964 ◽  
Vol 52 (10) ◽  
pp. 1254-1255
Author(s):  
J.R. Wait ◽  
W.B. Sisco ◽  
B.W. Porter
Keyword(s):  
Half Space ◽  
Electric Dipole ◽  
Horizontal Electric Dipole

Effect of a Conducting Overburden on the Fields of a Buried Dipole Source

1975 ◽  
Vol 53 (6) ◽  
pp. 598-609 ◽  
Author(s):  
V. Ramaswamy ◽  
H. W. Dosso
Keyword(s):  
Magnetic Fields ◽  
Electromagnetic Fields ◽  
Analytical Solutions ◽  
Electric Dipole ◽  
Lower Layer ◽  
Low Frequency ◽  
Dipole Source ◽  
Vertical Electric Dipole ◽  
Electric And Magnetic Fields ◽  
Horizontal Electric Dipole

Analytical solutions for the low frequency electromagnetic fields of a dipole source situated in the lower layer of a two layer conductor are derived. The sources considered are a vertical electric dipole, a horizontal electric dipole, and a horizontal magnetic dipole. The numerical results discussed in this paper describe the general behavior of the electric and magnetic fields for various upper layer conductivities, upper layer thickness, and source depths. The results are of interest in the application of electromagnetic techniques to locate miners trapped underground following a mine disaster.

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