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Direct solar irradiance

Direct insolation, also called direct normal irradiance (DNI), is the insolation measured at a given location on Earth with a surface element perpendicular to the Sun's rays, excluding diffuse insolation (the solar radiation that is scattered or reflected by gas molecules and particulate matter in the atmosphere). Direct insolation is equal to the solar…

Measurement & Art

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Surface-based measurement

World Radiometric Reference (WRR)PyrheliometersSolar trackerSr
4 related topics

Overview

InsolationEarthPerpendicularSun's raysDiffuse insolation
17 related topics

Simplified formula

AirmassSolar zenith angleAltitudeZenithDirect sunlight
5 related topics

Average direct insolation

Smog
1 related topics

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Overview

Simplified formula

Average direct insolation

Surface-based measurement

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Direct solar irradiance

Nodes32
Edges31
Triples0
Avg. degree1.94
Density0.0625
Components1

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Important terminology

solar direct irradiance insolation radiation dni atmosphere circumsolar angle zenith diffuse measurement pyrheliometers used normal measured sun day dirhi also

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SubjectPredicateObjectConfidenceSrc

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