Ground-wave propagation. Part 2: Theory for medium and long distances and reference propagation curves

Ground-wave propagation over a curved earth with a troposphere whose refractive index varies with height is considered with application to the CCIR reference exponential atmosphere. The residue-series and geometrical-optics methods are described. A ground-wave-propagation program GRWAVE has been written, and new propagation curves for frequencies from 10kHz to 30MHz are given. An interpretation in terms of an effective earth´s radius is supplied.