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Data files from a Multifilter Rotating Shadowband Radiometer (MFR-7) MFR data are in daily blocks, which are read using proprietary software from Yankee Environmental Systems, Inc. However, we have the capability to produce ASCII-format equivalents, and we will do so upon special request. MFR data from Eugene consists of either measurements taken once every 2.5 minutes or, since 1999, once every minute.
These files contain global, diffuse, and
direct normal beam measurements from one
broad band sensor and six narrow band sensors. A shadowband shades the sensor
once each measurement interval to measure the diffuse radiation. The diffuse
irradiance is corrected for the shading of the shadowband itself by performing
similar measurements with the shadow band positioned slightly to the left and
right of the sensor immediately prior to, and after, the diffuse measurement.
The direct normal values are obtained by subtracting the diffuse irradiance from
the global irradiance and projecting the result to normal incidence (dividing
by the cosine of the zenith angle).Required supplementary files Each MFR-7 ships with calibration and angle correction files (having file extensions ".cal" and ".sol", respectively). Occasionally, along with the equipment itself, these files undergo modifications, and care must be taken to ensure that the correct set of these supplementary files are used along with specific data files. Our Web page for downloading MFR data will also allow you to retrieve these, and instructions there indicate which of the (currently) three sets of supplementary files to use for each corresponding data file date range.  © 2000, UO Solar Radiation Monitoring Laboratory. Last
revised: December 17, 2000.
Home page URL: solardat.uoregon.edu |