ASTM-G177:2008 Edition

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G177-03(2008)e1 Standard Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37° Tilted Surface

Published By	Publication Date	Number of Pages
ASTM	2008	9

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Categories: 17.180.20 - Colours and measurement of light, ASTM

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Description

ASTM G177-03-e1-Reapproved2008

Historical Standard: Standard Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37° Tilted Surface

ASTM G177

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 providded 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 atmosphere-centimeters (atm-cm) equivalent thichkness.

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 (ADJG0173CD )to this standard) used to generate the standard spectra allows users to evaluate spectral differences relative to the spectra specified here.

Keywords

global hemispherical; materials exposure; terrestrial; ultraviolet solar spectral irradiance; Global solar irradiance; Solar spectral irradiance; Tables (measurement); Terrestrial systems; Ultraviolet (UV) solar spectral irradiance

ICS Code

ICS Number Code 17.180.20 (Colours and measurement of light)

DOI: 10.1520/G0177-03R08E01

PDF Catalog

PDF Pages	PDF Title
1	Scope
2	Referenced Documents Terminology TABLE 1
3	Technical Basis for the Tables Significance and Use
4	FIG. 1
5	Solar Spectral Irradiance Validation Keywords TABLE 2
6	X1. Description of Parameters Affecting Ultraviolet Spectral Transmission X1.1 Aerosol Optical Depth X1.2 Atmospheric Constituents and Absorbers FIG. 2
7	X1.3 Spectral Reflectance TABLE X1.1 TABLE X1.2
8	REFERENCES FIG. X1.1

Additional information

Standard Title	G177-03(2008)e1 Standard Tables for Reference Solar Ultraviolet Spectral Distributions: Hemispherical on 37° Tilted Surface
Published Code	ASTM
Publication Date	2008
Pages Count	9
ICS Codes	17.180.20 - Colours and measurement of light