环天顶弧的光和色的研究

Research on Light Intensity and Colors in the Circumzenithal Arcs

应用几何光学理论和衍射理论计算了环天顶弧的光强度分布和色品坐标，并给出了相对光强度曲线和色品曲线．探讨了太阳高度角和冰晶大小对环天顶弧颜色分布的影响．结果表明，衍射理论计算的色品曲线与实拍照片相符合．

Radial intensity profile and chromaticity coordinates of the circumzenithal arcs are calculated with the theory of geometrical optics and the diffraction theory of light,the relative intensity curve and chromaticity curve of the circumzenithal arcs are shown.The influence of high degree of the sun and the ice crystals size on colors of the circumzenithal are discussed. Simulated chromaticity curves are in agreement with the Greenlers colour photograph.