====== Multi-Filter Rotating Shadowband Radiometer (MFRSR) ======

{{:wiki:instruments:mfrsr01.jpg?direct&600|MFRSR@JOYCE ©B. Pospichal}} \\
//MFRSR installed at Jülich//

===== Principle =====

The **Multifilter Rotating Shadowband Radiometer (MFRSR)** is a passive instrument that measures global and diffuse components of solar irradiance at one broadband channel and at six narrowband channels, i. e. at 415, 500, 615, 673, 870, and 940 nm. Direct irradiance is subsequently calculated from the diffuse and global measured components. Each MFRSR measurement sequence includes measurements at four different shadowband positions: 1) at nadir (home position), 2) at the first side-band position, 3) sun-blocked, 4) at the second side-band position. The side-band measurements are used to correct for the portion of the sky obscured by the shadowband. From the MFRSR measurements, the aerosol optical depth at the wavelengths 415, 500, 615, 673 and 870 nm as well as the Angstrom exponent can be derived. For single-layer “horizontally homogeneous” liquid clouds, layer cloud optical depth and effective radius can also be retrieved. 




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

  * Direct, diffuse, and total irradiance in 5 spectral bands
  * Temporal resolution 15 seconds

 ===== Calibration and data quality control =====

  * Absolute calibration


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

Data are available on request, 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   ^ 
| Radiances   | 15 seconds    | 1 file per day (~1.5 MB)     | //DayYYYYMMDD.txt//  |    |



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

Data quicklooks can be found in the [[http://atmos.meteo.uni-koeln.de/~hatpro/dataBrowser/dataBrowser2.html?site=JOYCE&date=-1&UpperLeft=MFRSR_Narrowband&UpperRight=MFRSR_Broadband|JOYCE quicklook browser]].

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

{{wiki:examples:20200806_mfrsr_jue_l1_narrowband.png?direct&350|)}} \\
//Example time series of MFRSR spectral irradiances (total, diffuse, and direct) on 6 August 2020 at JOYCE.//




===== MFRSR History =====
^  Period  ^  Place  ^  Project  ^
| 06/07/2015 - today | [[http://www.fz-juelich.de/|Research Center Jülich]], Germany | JOYCE |






===== Technical Specifications =====
^ Parameter  ^ Specification ^
| Wavelengths | Silicon broadband pyranometer, 415, 500, 615, 673, 870, 940 nm |
| FWHM bandwidth | 10 nm |
| Cosine response | Better than 5% for 0 - 80° zenith angle; better than 1% with corrections  |
| Temporal Resolution | 15 s |
| Weight | 4.55 kg |
| Power Consumption | 110/220 VAC, 50/60 Hz (50 watts maximum) |
| Manufacturer | [[http://www.yesinc.com/|YES Inc.]]  |