Abstract

Water ice is widespread in the Solar System. Computer simulation of light scattering by ice particles designed to interpret the observational data should take into account the spectral dependence of the refractive index of water ice. However, in practice, a single fixed value of the refractive index is often used. In this paper, we show that poor choice of a fixed refractive index commonly leads to significant errors in estimating both the intensity and the degree of polarization of single-scattered light. We have found that a fixed value of the refractive index of ice particles m₀ = 1.3078 in the spectral region from 0.4 to 0.9 μm leads to minimal differences between the calculated characteristics of the light scattered by ice particles and those that take into account the spectral behavior of the refractive index. The most suitable values of the fixed refractive index for the widely used R, V, and I filters have been found. We have also studied the effect of the fixed refractive index of ice on the spectral dependence of the main parameters of the phase dependence of the linear polarization degree of single-scattered light, such as the magnitude and position of the minimum of the negative branch, the magnitude and position of the maximum of the positive branch, the inversion angle, and the polarimetric slope. The results of the calculations can be used to interpret the polarization of various objects of the Solar System that contain ice particles.

中文翻译：

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折射率的光谱相关性对冰粒极化特性的影响

摘要

水冰在太阳系中很普遍。用于解释观测数据的冰粒对光散射的计算机模拟应考虑水冰折射率的光谱依赖性。然而，实际上，通常使用单个固定的折射率值。在本文中，我们表明，固定折射率的选择不当通常会在估计单散射光的强度和偏振度时导致重大错误。我们发现冰粒的折射率的固定值为m ₀从0.4到0.9μm的光谱区域中的1.3078 =导致冰粒散射的光的计算出的特性与考虑到折射率的光谱特性的特性之间的差异最小。对于广泛使用的R，V和I滤光片，已经找到了最合适的固定折射率值。我们还研究了冰的固定折射率对单散射光线性偏振度的相位相关性主要参数的光谱相关性的影响，例如负分支最小值的大小和位置，正分支最大值的大小和位置，反转角和极化斜率。