IONOSPHERIC PROPAGATION DATA AND PREDICTION METHODS REQUIRED FOR THE DESIGN OF SATELLITE SERVICES AND SYSTEMS

considering a) that the ionosphere causes significant propagation effects at frequencies up to at least 12 GHz; b) that effects may be particularly significant for non-geostationary-satellite orbit services below 3 GHz; c) that experimental data have been presented and/or modelling methods have been developed that allow the prediction of the ionospheric propagation parameters needed in planning satellite systems; d) that ionospheric effects may influence the design and performance of integrated services digital network (ISDN) and other radio systems involving spacecraft; e) that these data and methods have been found to be applicable, within the natural variability of propagation phenomena, for applications in satellite system planning,