Cloud attenuation can be evaluated under the Rayleigh approximation, which is considered valid up to 300 GHz for small water particles, typically those with radii below 30 [micro]m [18], non associated to rainy conditions.
However, strong scattering effects caused by the interaction between high frequency radiation and water droplets are not evaluated by cloud attenuation models, which are fundamentally based on the effects of radiation absorption, and not on scattering processes.
Garcia-del-Pino, "Considerations on cloud attenuation at 100 and 300GHz for propagation measurements within the TeraSense project," Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP), 2011.
Uppala, "New prediction method of cloud attenuation," Electronics Letters, Vol.
