Field and Wave Electromagnetics 2nd Edition by David Cheng

Exercise 33

A uniform plane electromagnetic wave propagates in the +z- (downward) direction and impinges normally at z = 0 on an ocean surface. Let the magnetic field at z = 0 be H(0, t) = a y H 0 cos 10 4 t (A/m).
a) Determine the skin depth. (For the ocean: Conductivity = , permeability = 0.)
b) Find the expressions for H(z, t) and E (z, t).
c) Find the power loss per unit area (in terms of H 0 ) into the ocean.