ASTM G177-03(2020)
Standard Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37° Tilted Surface

Standard No.

ASTM G177-03(2020)

Release Date

2020

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM G177-03(2020)

Scope

1.1 The table provides a standard ultraviolet spectral irradiance distribution that maybe employed as a guide against which manufactured ultraviolet light sources may be judged when applied to indoor exposure testing. The table provides a reference for comparison with natural sunlight ultraviolet spectral data. The ultraviolet reference spectral irradiance is provided for the wavelength range from 280 to 400 nm. The wavelength region selected is comprised of the UV-A spectral region from 320 to 400 nm and the UV-B region from 280 to 320 nm. 1.2 The table defines a single ultraviolet solar spectral irradiance distribution: 1.2.1 Total hemispherical ultraviolet solar spectral irradiance (consisting of combined direct and diffuse components) incident on a sun-facing, 37° tilted surface in the wavelength region from 280 to 400 nm for air mass 1.05, at an elevation of 2 km (2000 m) above sea level for the United States Standard Atmosphere profile for 1976 (USSA 1976), excepting for the ozone content which is specified as 0.30 atmospherecentimeters (atm-cm) equivalent thickness. 1.3 The data contained in these tables were generated using the SMARTS2 Version 2.9.2 atmospheric transmission model developed by Gueymard (1,2). 1.4 The climatic, atmospheric and geometric parameters selected reflect the conditions to provide a realistic maximum ultraviolet exposure under representative clear sky conditions. 1.5 The availability of the SMARTS2 model (as an adjunct (ADJG173CD3 ) to this standard) used to generate the standard spectra allows users to evaluate spectral differences relative to the spectra specified here. 1 These tables are under the jurisdiction of ASTM Committee G03 on Weathering and Durability and are the direct responsibility of Subcommittee G03.09 on Radiometry. Current edition approved June 1, 2020. Published July 2020. Originally approved in 2003. Last previous edition approved in 2012 as G177 – 03(2012). DOI: 10.1520/G0177-03R20. 2 The boldface numbers in parentheses refer to the list of references at the end of this standard. 3 Available from ASTM International Headquarters. Order Adjunct No. ADJG173CD. Original adjunct produced in 2005. Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM G177-03(2020) Referenced Document

• ASTM E490 Standard Solar Constant and Zero Air Mass Solar Spectral Irradiance Tables*， 2022-04-01 Update
• ASTM E772 Standard Terminology Relating to Solar Energy Conversion

ASTM G177-03(2020) 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