Kippzonen CGR 4 Pyrgeometers Manuel d'utilisateur télécharger pdf (Page 30)

Appendix I Radiometric terminology

Term Explanation

Azimuth angle Angle in horizontal direction (0-360°)

Angle of incidence Incident angle from zenith (vertical)

Cosine response Detector response according to the cosine law

Global solar irradiance Total irradiance falling on a horizontal surface (Diﬀuse+Direct • cos α)

Irradiance Radiant ﬂux density (W/m²)

Long-wave radiation Radiation with wavelengths > 4 µm and < 100 µm

Long-wave downward radiation Radiation emitted by the sky

Net radiation Long-wave downward radiation minus outgoing radiation

Pyrgeometer Radiometer suitable to measure downward long-wave radiation

Short-wave radiation Radiation with wavelengths > 280 nm and < 4 µm

Thermopile Thermal detector made up of many thermocouple junctions

WMO World Meteorological Organisation

WRC World Radiation Center (in Davos, Switzerland)

Zenith angle Angle from zenith (0°, vertical)

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Kippzonen CGR 4 Pyrgeometers Manuel d'utilisateur Page 30