Rain attenuation of millimeter waves observed simultaneously by radiometer and bistatic radar

A simultaneous millimeter wave propagation study was undertaken at 94 GHz for a very short path in the bistatic radar mode and by a zenith-looking radiometer tuned at 22.235 GHz. The attenuation at 94 GHz during monsoon continued after rain stopped, and postrain absorption persisted for hours at 94 GHz and 22.235 GHz. The rain attenuation values at both wavelengths were often correlated. The only difference is that the details of attenuation profiles present for 94 GHz are not present for 22.235 GHz. The average attenuation values for the vertical and horizontal paths at 22.235 GHz and 94 GHz, respectively, were often uncorrelated.