Frequency dependence of microwave depolarization versus rain attenuation.

Calculations using oblate spheroidal raindrops, as well as measured data, demonstrated that rain-induced cross polarization amplitude is inversely proportional to frequency from 10 to 30 Ghz. Except for extremely low rain rates (-2.5 MM/HR). the above frequency dependence has now been found to be also true for the more realistic (Pruppacher and Pitter shape) raindrops. This clarification is presented to revise the frequency dependence of the CCIR formula on rain-induced cross polarization versus attenuation.