Box M A, Deepak A
Appl Opt. 1981 Aug 15;20(16):2806-10. doi: 10.1364/AO.20.002806.
Although it is usually assumed that solar radiation falls on the earth's atmosphere in the form of plane waves, the finite angular size of the solar disk contradicts this assumption. For most purposes, this finite sun effect on computed or measured radiation quantities is negligible. However, in the region of the solar aureole, which is dominated by aerosol diffraction scattering, measurable effects may be obtained. In this paper, we show that the finite sun effect is related to derivatives of the scattering phase function and that a 1% effect may be obtained close to the sun if enough large particles are present in the atmosphere.
虽然通常认为太阳辐射是以平面波的形式照射到地球大气层的，但太阳圆盘的有限角大小与这一假设相矛盾。对于大多数情况而言，这种有限太阳对计算或测量的辐射量的影响可以忽略不计。然而，在以气溶胶衍射散射为主的日晕区域，可能会获得可测量的效应。在本文中，我们表明有限太阳效应与散射相位函数的导数有关，并且如果大气中存在足够多的大粒子，在靠近太阳的地方可能会获得1%的效应。
