Scattering by Hail and Sleet Particles at Microwave and Millimeter Wave Frequencies

Scattering by hail and sleet particles, prolate and oblate spheroids with axial ratios up to 1.8, is considered using the point matching technique. For computing, the truncated modal index and the recurrence relations are discussed. Numerical results, at 30 and 100 GHz, show that the extinction cross sections of the hail particles oscillate around twice the geometrical cross sections of the particles in the resonance region. It is found that the bistatic scattering and the back scattering depend strongly on the material components of the particles. The effects of the particle shape on the extinction cross section, the bistatic scattering cross section and the radar back scattering cross section are shown.