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Calculating the radar signal reflected from cirrus cloud by discrete dipole approximation

The report presents database of microwave radiation scattering matrices for ice particles of cirrus clouds. The calculations were performed for meteorological radars operating at frequencies of 35 and 94 GHz. The calculation was carried out for randomly oriented ice particles of the following shapes: hexagonal plates and columns, aggregate, bulletrosette, droxtal and irregular shape particle. The particle size ranges from 10 to 10000 microns. It has been found out that the Rayleigh scattering theory for these radar wavelengths is not applicable to the full spectrum of ice crystals observed in the clouds. Specific threshold sizes are determine for each crystal shape. The results can be used to interpret joint radar-lidar measurements.