Effect of scattering by rain on radiometer measurements at millimetre wavelengths

Scattering by rain is often neglected when evaluations of attenuation are made from aerial-noise temperatures observed by radiometers. Calculations show that values may be significantly low if the attenuation is assumed to be due only to absorption in the rain. Curves are given for estimating errors at frequencies of 37, 72 and 110 GHz.