Gedzelman S D
Appl Opt. 1975 Dec 1;14(12):2831-7. doi: 10.1364/AO.14.002831.
A theory for the color of the sky near the horizon for an observer in the umbral region of a total solar eclipse is presented. The model uses a Rayleigh scattering atmosphere, and the light reaching the observer is a beam of singly scattered sunlight, which, in turn, has suffered depletion by scattering in its passage from outside the shadow region. The model predicts both the red color observed in the lowest 8 degrees of the sky for the total solar eclipse of 30 June 1973 and the enriched blue color of the sky at any elevation angle greater than the solar elevation angle. The model is also adapted to explain the reddening of the horizon sky observed during such times as when a dark cloud passes overhead or when the light from a large city is seen from the distance at night.
本文提出了一种针对日全食本影区内观察者而言地平线附近天空颜色的理论。该模型采用瑞利散射大气，到达观察者的光是一束单次散射的太阳光，而这束光在从阴影区域外穿过时因散射而衰减。该模型预测了1973年6月30日日全食时天空最低8度处观测到的红色，以及太阳仰角以上任意仰角处天空增强的蓝色。该模型还适用于解释在诸如乌云从头顶飘过或夜晚从远处看到大城市灯光时所观测到的地平线天空变红现象。
