Variability of the 0° Isotherm: Monthly Variations and Correlation with Ground Temperature

Rain attenuation prediction models usually require rain height data that can be derived from the 0°C isotherm height obtained as proposed in ITU-R Recommendations and also from radiosonde measurements. Communication systems that make use of fade mitigation techniques require accurate information on the parameters that describe the variability of the propagation channel caused by various impairments. Statistical results on the variations of the 0°C isotherm are presented in this paper focusing on the monthly variability and on the correlation with ground temperature.