ITU-R P.527-4 PDF

This Recommendation gives methods to model the electrical characteristics of the surface of the Earth, including pure water, sea water, ice, soil and vegetation cover, for frequencies up to 1 000 GHz, in a systematic manner based on the evaluation of complex relative permittivity. In all cases conductivity can be calculated as a function of frequency and temperature from these evaluations. Previous information on electrical characteristics below 30 MHz in terms of permittivity and conductivity is retained in Appendix in view of its association with Recommendations ITU-R P.368 and ITU-R P.832. The new modelling method is fully compatible with this earlier information.