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Multi-Filter Rotating Shadowband Radiometer (MFRSR)

MFRSR@JOYCE ©B. Pospichal
MFRSR installed at Jülich


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 data request sheet and send it to

Dataset Temporal resolution File size Filename Remarks
Radiances 15 seconds 1 file per day (~1.5 MB) DayYYYYMMDD.txt

Data quicklooks can be found in the JOYCE quicklook browser.

Measurement examples

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 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 YES Inc.
mfrsr.txt · Last modified: 2021/03/01 11:16 by bpospich