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University of Bergen
Geophysical Institute

Instruments at the Radiation Observatory

Here you will find information on the different instruments for measurements of shortwave solar radiation and longwave terrestrial radiation at the Radiation Observatory

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  • GLOBAL RADIATION, i.e. total shortwave radiation from the sun (direct radiation + diffuse radiation scattered from the sky) on a horizontal surface, is measured by a Kipp & Zonen CM11 pyranometer.
  • DIFFUSE (SKY) RADIATION, i.e. total shortwave diffuse radiation from the sun (scattered from the sky) on a horizontal surface, is also measured by a Kipp & Zonen CM11 pyranometer. By measurements of diffuse radiation, the direct solar radiation d off by the use of a circular disc with diameter 6 cm mounted on a 30 cm long moving arm.
  • DIRECT NORMAL INCOMING RADIATION, which is the direct solar radiation on a surface normal to the solar beam, is measured by at Eppley Normal Incidence Pyrheliometer, Model NIP. The instrument is mounted on a tracking device, Eppley Automatic Solar Tracker Model SMT-3 , following the sun.
  • ULTRAVIOLET RADIATION on a horizontal surface is measured with a Eppley Total Ultra Violet Radiometer TUVR which has a response in the wavelength region 290 - 385 nm.
  • (Erythemal) UV-B RADIATION, which is the UV-radiation in the UV-B region (280 - 320 nm), weighted with the response function of  the human skin, is measured in MED (MinimumErythemal Dose) by a Solar Light UV Biometer 501A.
  • DOWNWARD LONGWAVE ATMOSPHERIC RADIATION is estimated from longwave radiation measured by a Eppley pyrgeometer.
  • EFFECTIVE OUTGOING LONGWAVE RADIATION from a "black" surface at the air temperature, is also estimated from longwave radiation measured by a Eppley pyrgeometer.
  • SUNSHINE DURATION is measured with a Campbell-Stoke sunshine recorder registered according to the WMO regulations.
  • SUNSHINE DURATION is also estimated as the number of minutes with irradiances above 120 Wm-2 (measurements each 20. second) from measurements by the Eppley Normal Incidence Pyrheliometer (NIP). (Missing registrations by the the Campbell-Stoke instrument are, in few given occasions replaced by NIP-durations above 200 Wm-2)

 

  • The Datalogger system consists of a Fluke Helios I Computer Front End (CFE), a PC and a line printer.
19.02.2014