Two types of errors made in prediction wave attenuation by rain

Most methods proposed for predicting wave attenuation due to rain aim to derive the statistical distribution of attenuation on a path from the statistical distribution of rain rate at a point of the path. For that, these methods require the choice of a space model of rainy area or rainy volume. It appears that two erroneous assumptions are often made in these models. In the horizontal rain model there is confusion in the general concept of rain cells, between the rainy area of 15 to 20 kilometers in diameter which has to be considered for rain attenuation and the core of a few kilometers in diameter which has to be considered for rain scatter. In the vertical rain model, there is confusion between the vertical extent of rain fall and the height of 0 deg isotherm. In fact these quantities may be significantly different especially for low latitudes. These two erroneous assumptions are partly responsible for delaying the elaboration of a simple and reliable rain model for the prediction of rain attenuation.