Abstract
A new Rayleigh approximation for the scattering of electromagnetic wave by spherical sand with non-uniformly distributing charge is proposed, and some numerical simulation results on the differential scattering cross section (DSCS) and the scattering efficiency are discussed. The results show that, the DSCS presents an obviously spatial distribution while the charge is non-uniformly distributing on particles, but it shows an isotropic scattering property while the charge uniformly distributes on the sand. In addition, for a given charge density, the scattering efficiency for the former is much smaller than the one when the charge uniformly distributes on sand, but in some charged angle the law becomes contrary to the former law. These results illustrate that it is needed to consider the effect of the surface charge and its distribution form while using the microwave radar to monitor the dust storms. © 2015, Chinese Laser Prees. All right reserved.
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