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What is the recovery effect on a mixed land and sea path?

  • A.The wave recovers the energy it lost while travelling over the land
  • B.Field strength rises again after the wave passes onto sea water
  • C.The signal recovers its original polarisation after crossing the coast
  • D.Field strength falls sharply and then returns to its previous value

Answer: B

Passing from poor ground onto highly conducting sea, the wave's attenuation rate drops abruptly and the field strength rises above what the land alone would have given, an effect sometimes called coastal recovery. No energy is regained; the rate of loss simply falls. Polarisation is unchanged throughout. The asymmetry of the effect, being different for a land to sea path and a sea to land one, is what Millington's method was devised to handle correctly.

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