Electromagnetic propagation in an idealized earth crust waveguide,part I |
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| Authors: | James R Wait Kenneth P Spies |
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| Institution: | (1) Cooperative Institute for Research in Environmental Sciences, University of Colorado, 80302 Boulder, Colorado;(2) Office of Telecommunications, U.S. Department of Commerce, Institute for Telecommunication Sciences, 80302 Boulder, Colorado |
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| Abstract: | Summary The electromagnetic mode characteristics for the earthcrust waveguide are considered. The formulation allows for any depth-conductivity profile, but the specific results are only for a homogeneous sub-surface waveguide region with a finitely conducting lower layer and a perfectly conducting upper layer. Attenuation rates of the order of 1 dB/km are possible for operating frequencies of 20 kHz or lower if the crystalline rock in the waveguide has conductivities less than 10–6 mhos per meter. |
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