利用布格定律计算了空气质量为零时的辐射和消光系数，该定律适用于正常日照和由锐截止滤光片OG1、RG2和RG8定义的太阳光谱的八个波段。报告每个月的月平均值的年变化。还包括一年中每个月的平均正入射能量和以0到6小时角通过每个过滤器的能量。研究了每个过滤器测得的正常日照分数的变化，可以表示为空气质量的线性函数。通过计算太阳高度连续1度阶跃的年平均波段能量，检验了高度对波段能量的影响。浑浊度也有报道。 引用:俄亥俄州辛辛那提市ASHRAE学报第87卷第2部分

The irradiation at air mass zero and the extinction coefficient are calculated using Bouguer's law for the normal insolation and the eight bands of the solar spectrum defined by the sharp cut-off filters OG1, RG2 and RG8. The annual variation of the monthly average for each is reported. Also included is the average normal incidence energy and the energy passing each of the filters at hour angles of zero to six for each month of the year. The change in the fraction of normal insolation measured by each filter is investigated and may be expressed as a linear function of air mass. The effect of altitude on band energy is examined by calculating the yearly average band energy for sequential one degree steps of solar altitude. Turbidity is also reported.