Kipp&Zonen CHP 1 Pyrheliometer - Manual (Page 17)

17
APPENDIX I RADIOMETRIC TERMINOLOGY
Term
Explanation
Albedo
The portion of incoming radiation which is reflected by a surface
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
Diffuse solar irradiance
Solar radiation, scattered by water vapor, dust and other particles as
it passes through the atmosphere
Direct solar irradiance
Radiation that has traveled a straight path from the sun
Global solar irradiance
Total irradiance falling on a horizontal surface (Diffuse + Direct ⋅ cos α)
Irradiance
Radiant flux density (W/m 2 )
Long-wave radiation
Radiation with wavelengths > 4 μm and < 100 μm
Pyrheliometer
Radiometer suitable to measure short-wave global radiation
Pyrgeometer
Radiometer suitable to measure downward long-wave radiation
Pyrheliometer
Radiometer suitable to measure direct irradiance
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)
WRR
World Radiation Reference (standard radiation scale)
WSG
World Standard Group (radiometer standards maintained in Davos)
Zenith
angle Angle from zenith (0 °, vertical)