Transmission Loss Curves for Propagation at Very Low Radio Frequencies

Curves of the transmission loss are presented for the propagation to great distances at frequencies in the range 10 to 20 kc. The theoretical model of the ionosphere assumed is a sharply bounded homogeneous ionized medium. The working formula for the field is a sum of waveguide-type modes. The calculated results compare favorably with experimental data at 16.6 kc over the Pacific Ocean.