ASTM G177-03(2012)
Standard Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37deg; Tilted Surface

Standard No.

ASTM G177-03(2012)

Release Date

2003

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM G177-03(2020)

Latest

ASTM G177-03(2020)

Scope

5. Significance and UseTop Bottom

5.1 This standard does not purport to address the mean level of solar ultraviolet spectral irradiance to which materials will be subjected during their useful life. The spectral irradiance distributions have been chosen to represent a reasonable upper limit for natural solar ultraviolet radiation that ought to be considered when evaluating the behavior of materials under various exposure conditions.

5.2 Absorptance, reflectance, and transmittance of solar energy are important factors in material degradation studies. These properties are normally functions of wavelength, which require that the spectral distribution of the solar flux be known before the solar-weighted property can be calculated.

5.3 The interpretation of the behavior of materials exposed to either natural solar radiation or ultraviolet radiation from artificial light sources requires an understanding of the spectral energy distribution employed. To compare the relative performance of competitive products, or to compare the performance of products before and after being subjected to weathering or other exposure conditions, a reference standard solar spectral distribution is desirable.

5.4 A plot of the SMARTS2 model output for the reference hemispherical UV radiation on a 37?? south facing tilted surface is shown in Fig. 1. The input needed by SMARTS2 to generate the spectrum for the prescribed conditions are shown in Table 1.

FIG. 1 Total Hemispherical Ultraviolet Reference Spectra Based on SMARTS2 Runs for AM1.05 UV Spectral Profile (a) Linear Scale; (b) Logarithmic Scale

TABLE 1 SMARTS Version 2.9.2 Input File to Generate the Reference Spectra

Card ID	Value	Parameter/Description/Variable Name
1	'A...... ASTM G177-03(2012) Referenced Document ASTM E490 Standard Solar Constant and Zero Air Mass Solar Spectral Irradiance Tables ASTM E772 Standard Terminology Relating to Solar Energy Conversion ASTM G177-03(2012) history 2020 ASTM G177-03(2020) Standard Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37° Tilted Surface 2003 ASTM G177-03(2012) Standard Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37deg; Tilted Surface 2003 ASTM G177-03(2008)e1 Standard Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37x00B0; Tilted Surface 2003 ASTM G177-03e1 Standard Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37 Tilted Surface 2003 ASTM G177-03 Standard Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37 Tilted Surface Copyright ©2024 All Rights Reserved