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Appendix I Radiometric terminology
Term
Azimuth angle
Angle of incidence
Cosine response
Global solar irradiance
Irradiance
Long-wave radiation
Long-wave downward radiation Radiation emitted by the sky
Net radiation
Pyrgeometer
Short-wave radiation
Thermopile
WMO
WRC
Zenith angle
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Explanation
Angle in horizontal direction (0-360°)
Incident angle from zenith (vertical)
Detector response according to the cosine law
Total irradiance falling on a horizontal surface (Di use+Direct • cos α)
Radiant flux density (W/m²)
Radiation with wavelengths > 4 µm and < 100 µm
Long-wave downward radiation minus outgoing radiation
Radiometer suitable to measure downward long-wave radiation
Radiation with wavelengths > 280 nm and < 4 µm
Thermal detector made up of many thermocouple junctions
World Meteorological Organisation
World Radiation Center (in Davos, Switzerland)
Angle from zenith (0°, vertical)
CGR 4 Manual
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