====== Broadband radiation  ======

{{:wiki:instruments:radiation01.jpg?direct&400|JOYCE-JOYRAD35 ©B. Pospichal}} 
{{:wiki:instruments:radiation05.jpg?direct&400|JOYCE-JOYRAD35 ©B. Pospichal}} \\
//Sun tracker and Radiation sensors installed at Jülich//

===== 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. For further information about the measurements, please contact [[https://www.fz-juelich.de/SharedDocs/Personen/IEK/IEK-8/DE/PhotochemieUndRadikale/bohn_birger.html?|B. Bohn]]


===== JOYCE-CF Standard Operation Procedures =====

  * Standard measurements of pyranometer and pyrgeometer are performed with 5 second integration time.


===== Calibrations and data quality assurance procedures =====
  * Regular instrument calibration performed
  * Cross-check with other radiation sensors

===== Data availability =====

The following data products are provided via the SAMD database. If you would like to have additional data or recent data that have not been uploaded to SAMD yet, please fill the {{ :joyce_data_request_form.pdf |data request sheet}} and send it to [[mailto:info@joyce.cloud|info@joyce.cloud]]. 

 
^ Dataset     ^ Temporal resolution       ^ File size          ^ Filename   ^ Remarks   ^ 
| Downwelling shortwave irradiance   | 5 seconds    | 1 file per day (555 KB)     | //sups_joy_pyr00_l1_rlds_v01_YYYYMMDDHHMMSS.nc//  | available via SAMD   |
| Downwelling longwave irradiance   | 5 seconds    | 1 file per day (555 KB)     | //sups_joy_pyrg00_l1_rlds_v01_YYYYMMDDHHMMSS.nc//  | available via SAMD   |




===== Link to current observations =====

Data quicklooks can be found in the [[http://atmos.meteo.uni-koeln.de/~hatpro/dataBrowser/dataBrowser1.html?site=JOYCE&date=-31&UpperLeft=Radiation_downwelling_fluxes|JOYCE quicklook archive]]. Attention, quicklooks are only available several days after the measurement. 

===== Measurement examples =====

{{wiki:examples:20190804_jue_radiation_v00.png?direct&600|Radiation_obs}}




=====  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.



===== Technical 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 |