抄録
The method of operators utilized effectively for calculating the field of a dipole above the plane earth is applied to the problem of a line source parallel to a homogeneous plasma layer being modified in order to be adapted for the two-dimensional case. It is pointed out that the generation of the pole waves such as surface waves or leaky waves is denied even in the case of an anisotropic or compressible plasma so far as the continuity of the energy flow is assured. The evidence is based upon the cancellation of the residue term at the pole by the exact calculation of the contribution from the pole in the contour integral in the same manner as in the case of the surface wave called by Sommerfeld.
