Kipp&Zonen CMA 6 Albedometers - Manual (Page 35)

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Instruction Manual - CMP/CMA series
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Term Explanation
Albedo The portion of incoming radiation which is reflected by a surface
Azimuth angle Angle in horizontal direction (0 to 360°) normally referred to North
Cosine response Radiometer directional response according to the cosine of the zenith angle
Diffuse horizontal irradiance Solar radiation, scattered by water vapour, dust and other particles as it passes through
the atmosphere, falling onto a horizontal plane surface (DHI)
Direct normal irradiance Radiation that has travelled in a straight path from the sun falling onto a plane surface
normal to the beam (DNI)
Global horizontal irradiance Total irradiance falling onto a horizontal plane surface (GHI)
Global = Diffuse + (Direct x cos α); α is the solar zenith angle
Irradiance Radiant flux density (W/m²)
Long-wave radiation Radiation with wavelengths from 4 µm to more than 40 µm
Pyranometer Radiometer for measuring short-wave global radiation
Pyrgeometer Radiometer for measuring long-wave radiation
Pyrheliometer Radiometer for measuring direct short-wave radiation
Short-wave radiation Radiation with wavelengths from approximately 300 nm to 4000 nm (4 µm)
Thermopile Thermal detector made up of many thermocouple junctions
WMO World Meteorological Organisation, Geneva, Switzerland
WRC World Radiation Centre, Davos, Switzerland
WRR World Radiometric Reference (standard radiation scale) at WRC
WSG World Standard Group of radiometers at WRC
Zenith angle Angle from zenith (0° is vertical, 90° is horizontal)
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