===== Radiation Sensors =====
//Mentor: [[http://www.fz-juelich.de/SharedDocs/Personen/IEK/IEK-8/EN/RadiationAndPhotolysis/bohn_birger.html|B. Bohn]]//
 
===== Principle =====

Two pyranometers (CMP 21), a pyrheliometer (CHP 1) and a pyrgeometer (CGR 4) are used to measure solar shortwave radiation and terrestrial longwave radiation. One pyranometer receives total downward solar irradiance. The other instruments are mounted on a suntracker (SOLYS 2) measuring diffuse downward solar irradiance (shaded pyranometer), direct solar irradiance (pyrheliometer) and terrestrial downward irradiance (shaded pyrgeometer). All instruments were produced and calibrated by Kipp&Zonen B.V., Netherlands.   
===== Instrument =====
{{:instruments:radiation:suntracker.jpg?300|}} \\
Suntracker SOLYS at [[http://www.fz-juelich.de/portal/EN/Home/home_node.html|Forschungszentrum Jülich]] on the roof of the IEK-8 ([[http://www.fz-juelich.de/iek/iek-8/EN/Home/home_node.html|Institut für Energie- und Klimaforschung: Troposphäre]]).



===== Data =====

  * If you are interested in receiving data data please contact: [[http://www.fz-juelich.de/SharedDocs/Personen/IEK/IEK-8/EN/RadiationAndPhotolysis/bohn_birger.html|B. Bohn]]
  * [[http://atmos.meteo.uni-koeln.de/~hatpro/dataBrowser/dataBrowser1.html?site=JOYCE&date=2018-10-04&UpperLeft=Radiation_downwelling_fluxes&UpperRight=Cimel_Cloudmode|quicklook archive]]

===== History =====
^  Period  ^  Place  ^  Project  ^
|  April 2014 - today | Forschungszentrum Jülich | JOYCE |

Total solar irradiance measurements started in 2006, pyrgeometer measurments in 2011, suntracker measurements in 2014.
===== Specifications =====
^  Parameter  ^  Specification  ^  Remark  ^
| Total solar irradiance (CMP 21)| Secondary standard (WMO)| |
| Diffuse solar irradiance (CMP 21)| Secondary standard (WMO)| shaded |
| Direct solar irradiance (CHP 1)| First class (WMO)| tracked |
| Terrestrial irradiance (CGR 4)| Certified calibration | shaded |
| Manufacturer | Kipp & Zonen B.V., NL | |
| Data logger (CR3000)| 16-bit | 5 s time resolution |
| Manufacturer | Campbell Scientific Inc., UK |

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