1.1这些表定义了所有太阳能应用中使用的气团1.5太阳光谱辐照度分布，其中太阳辐照度、漫射辐照度和直射辐照度部分需要标准地面光谱辐照度，即入射到面向太阳的37°倾斜表面上。标准E891中给出了直接法向辐照度的类似标准。 1.2这些表格是使用零空气质量太阳光谱生成的建模数据，该光谱基于Neckel和Labs（1）修订的地外光谱、BRITE（3，4）蒙特卡洛辐射传输代码和1962年美国。 S、 带有农村气溶胶（6、7、8）的标准大气（5）。更多详细信息见附录X1。 1.3用于生成地面光谱的空气质量零（AM0）光谱由C.Frohlich和C.Wehrli（1）提供，是修订和扩展的Neckel和Labs（2）光谱。正如Frohlich（9）引用Hardrop（10）的研究所报告的那样，Neckel和实验室通过使用较新的肢体变暗数据将辐射转换为辐照度来修改其光谱。Frohlich与夏威夷MaunaLoa校准太阳光度计数据的比较表明，这种新的地外光谱是目前可用的最佳光谱。 1.4地面太阳光谱数据的开发基于Bird、Hulstrom和Lewis（11）报告的工作。在使用BRITE Monte Carlo辐射传输代码计算地面值时，引用的作者仅将迭代次数增加到2.4500μm。我们使用原始标准E892-82中的16个λi值将光谱扩展到4.045μm。标准E892-82中的辐照度值是根据标准E490表示的地外光谱计算的。增加了额外的数据点，以说明该区域的太阳辐照度约为1。 在0.305和4.045μm之间的总辐照度的5%。这样做传播的误差很小。 1.5本标准选择的空气质量为1.5，浊度为0.27，倾角为37°，因为它们代表了美国48个相邻州的平均条件。

1.1 These tables define an air mass 1.5 solar spectral irradiance distribution for use in all solar applications where a standard terrestrial spectral irradiance is required for that part of solar irradiance, diffuse, and direct, that is incident on a sun-facing, 37°-tilted surface. A similar standard for direct normal irradiance is given in Standard E891. 1.2 These tables are modeled data that were generated using a zero air mass solar spectrum based on the revised extraterrestrial spectrum of Neckel and Labs (1), the BRITE (3, 4) Monte Carlo radiative transfer code, and the 1962 U.S. Standard Atmosphere (5) with a rural aerosol (6, 7, 8). Further details are presented in Appendix X1. 1.3 The air mass zero (AM0) spectrum that was used to generate the terrestrial spectrum was provided by C. Frohlich and C. Wehrli (1) and is a revised and extended Neckel and Labs (2) spectrum. Neckel and Labs revised their spectrum by employing newer limb-darkening data to convert from radiance to irradiance, as reported by Frohlich (9), citing the study by Hardrop (10). Comparisons by Frohlich with calibrated sunphotometer data from Mauna Loa, Hawaii, indicate that this new extraterrestrial spectrum is the best currently available. 1.4 The development of the terrestrial solar spectrum data is based on work reported by Bird, Hulstrom, and Lewis (11). In computing the terrestrial values using the BRITE Monte Carlo radiation transfer code, the authors cited took the iterations to 2.4500 [mu]m only. We have extended the spectrum to 4.045 [mu]m using sixteen [lambda]i values from the original Standard E892-82. Irradiance values in Standard E892-82 were computed from the extraterrestrial spectrum represented by Standard E490. The additional data points were added to account for the solar irradiance in this region that account for approximately 1.5% of the total irradiance between 0.305 and 4.045 [mu]m. The errors propagated by doing so are insignificant. 1.5 An air mass of 1.5, a turbidity of 0.27, and a tilt of 37° were chosen for this standard because they are representative of average conditions in the 48 contiguous states of the United States.