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Absorption mode for e.l.f. electromagnetic propagation in the Earth-crust waveguide

Absorption mode for e.l.f. electromagnetic propagation in the Earth-crust waveguide

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Using a highly idealised 3-layer model of the Earth's crust, it is shown that the modes of propagation fall into two classes. The conventional type leads to attenuation rates greater than the intrinsic attenuation rate for plane waves in the medium of lowest conductivity. The other type of solution leads to attenuation rates that are anomalously low. It is shown that this mode of propagation corresponds to a condition of complete absorption of an inhomogeneous plane wave incident from below the waveguide. To excite this absorption mode, we would need an aperture of infinite extent!

References

    1. 1)
      • Spies, K.P., Wait, J.R.: `On calculations of the modal parameters of an idealized Earth-crust waveguide', AD721 371, ONR technical report 1, 1971.
    2. 2)
      • Spies, K.P., Wait, J.R.: `Attenuation calculations for a two-layer Earth-crust waveguide for sub-surface electromagnetic propagation', AD 726 754, ONR technical report 2, 1971, available from the.
    3. 3)
      • J.R. Wait , K.P. Spies , J.G. Heacock . (1971) Note on calculations of propagation parameters for an idealized earth-crust waveguide, The structure and physical properties of the Earth's crust.
    4. 4)
      • K.G. Budden . (1961) , The waveguide mode theory of wave propagation.
    5. 5)
      • J.R. Wait . (1962) , Electromagnetic waves in stratified media.
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