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ISO 9845-1:1992 Solar energy -- Reference solar spectral irradiance at the ground at different receiving conditions -- Part 1: Direct normal and hemispherical solar irradiance for air mass 1,5
standard by International Organization for Standardization, 10/01/1992
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Provides an appropriate standard spectral irradiance distribution to be used in determining relative performance of solar thermal, photovoltaic, and other system components and materials where the direct and hemispherical irradiance component is desired. The tables presented define an air mass 1,5 solar spectral irradiance for the direct normal radiation - 5,8 field-of-view angle - and hemispherical radiation on an equator-facing, 37 tilted plane for an albedo of 0,2. These tables are intended to represent ideal clear sky conditions.