13 February 2001 Analysis of lidar backscattering enhancement for pristine hexagonal ice crystals
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Abstract
We analyze lidar backscattering enhancement for pristine hexagonal ice crystals by using Fraunhofer diffraction based on Kirchhoff's diffraction theory (KD). Our numerical computations show that received power Pr(Z) at the altitude Z in lidar equation is proportional to Z-?, where ? is a function of Z, size and shape of particles. Pr(Z) is proportional to Z-1.5 for hexagonal plate and column randomly oriented in horizontal plane at Z=200 m where its aspect ratios are 1/3 and 3 and mode radiuses are 100,um. Our calculations suggest hexagonal ice crystals that have mode radiuses of 100 ?m and 30 ?m with perfectly oriented in horizontal plane have anomalous backscattering enhancement compared with a sphere at even high altitude. This might explain the phenomena reported by Platt et. al. (1978).1,2
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Suginori Iwasaki, Suginori Iwasaki, Hajime Okamoto, Hajime Okamoto, } "Analysis of lidar backscattering enhancement for pristine hexagonal ice crystals", Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); doi: 10.1117/12.417094; https://doi.org/10.1117/12.417094
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