Tropospheric stratification and anomalous propagation

The progress to date was summarized for predicting the enhanced fields that were encountered in a stratified atmosphere. The ducting conditions associated with supercritical refractivity gradients both aloft and at or near the surface were considered. As a basis for estimating the likelihood of these supportive conditions, the available information was surveyed. It was suggested that the access to computers and the availability of historical radiosonde data be exploited to map the pertinent characteristics of tropospheric layers on a worldwide basis to meet the interference prediction requirements of the telecommunications regulatory agencies.