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The Ratio of Diffuse to Direct Solar Irradiance (Perpendicular to the Sun's Rays) with Clear Skies—A Conserved Quantity Throughout the Day
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1981
Year
Environmental MonitoringEngineeringSolar ConvectionRung RegionsSolar-terrestrial InteractionSolar PhysicEarth ScienceRadiative TransferSolar Terrestrial EnvironmentAbsolute ValueAtmospheric ScienceSolar ActivityMeteorologyRadiation MeasurementSpace WeatherAstrophysicsClimatologyRadiative Transfer ModellingAtmospheric ConditionSolar VariabilityPhotometry (Optics)Direct Solar IrradianceSolar Radiation ManagementDiffuse IrradianceUrban Climate
The ratio of diffuse irradiance to direct normal is a conserved quantity throughout the day. Though its absolute value depends on the condition of the atmosphere, ground reflection and obstruction of horizon, once this value is established (by a single measurement) in rung regions. it persists over the entire day. Urban and heavy polluted areas may show considerable daily trends.