日本リモートセンシング学会誌
Online ISSN : 1883-1184
Print ISSN : 0289-7911
ISSN-L : 0289-7911
FDTD法を用いた六角柱aggregate粒子の光散乱計算
石元 裕史
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ジャーナル フリー

2006 年 26 巻 4 号 p. 283-295

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A numerical code of finite-difference time domain (FDTD) method to solve a light scattering by irregular particles has been developed. Using a standard 2nd order FDTD scheme and an absorbing boundary condition by a perfectly matched layer (PML), it is found that the light scattering features for size parameter x≤50 at wavelength 1.381μm for spherical ice particles have been successfully demonstrated by this FDTD code with spatial grid increment δ= 2./20. In the same numerical conditions, the light scattering calculations for hexagonal column aggregates are performed taking into account the particle's random orientation. The averaged phase function for the aggregate shows rather a flat angular dependence with no prominent peak features, which differs from the results of geometrical optics approximations for larger aggregate particles. Furthermore, a decrease of the side/back scattering efficiency and an increase of the asymmetry factor around the interference region of the particle's size are confirmed.

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