The MFR-7 shadow band radiometer has a rotating strip that shades the diffuser (sensor) at precise intervals throughout the day. When the shadow band shades the diffuser only indirect radiation is measured. Indirect is all the radiation that comes from the 180 degrees of sky and clouds. When the diffuser is not shaded it measures direct plus indirect. The software calculates from this the direct, indirect and total insolation in watts per meter. This is significant because focusing collectors require direct sunlight in order to reflect beams of light to a point. Flat collectors also vary in their ability to capture indirect sunlight, or sunlight filtered through clouds.
More info: MFR-7 Multi-Filter Rotating Shadowband Radiometer
Check this page for a complete list of all available csv files. A new file is generated every day.
Click here to download csv's
Clean Energy Institute provides a set of auto-generated, online visualizations of its data sets, to help you explore trends in the data.
Click here to see data visualizations
CSV files have the following fields:
| date | Month/Day/Year |
| time | Seasonally corrected Pacific Standard or Daylight Time |
| serialtime | Shown in the form (days since 1900).(Fraction of a 24 hour day) in UTC time |
| cos | Cosine of the solar zenith angle (90 the elevation), cos(90 = 0), cos(0)=1 |
| temp(°C) | Temperature of collector |
| HTRV(V) | |
| tot(W/m^2) | Total of all radiation including direct and indirect (diffuse) in watts per square meter |
| tot414((W/m^2)/nm) | Total watts per square meter measured at 414nm wavelength |
| tot496((W/m^2)/nm) | Total watts per square meter measured at 496nm wavelength |
| tot613((W/m^2)/nm) | Total watts per square meter measured at 613nm wavelength |
| tot670((W/m^2)/nm) | Total watts per square meter measured at 670nm wavelength |
| tot869((W/m^2)/nm) | Total watts per square meter measured at 869nm wavelength |
| tot937((W/m^2)/nm) | Total watts per square meter measured at 937nm wavelength |
| diffuse(W/m^2) | Total of all diffuse radiation including clouds and blue sky, having direct sunlight removed, in watts per square meter |
| diffuse414((W/m^2)/nm) | Diffuse watts per square meter measured at 414nm wavelength |
| diffuse496((W/m^2)/nm) | Diffuse watts per square meter measured at 496nm wavelength |
| diffuse613((W/m^2)/nm) | Diffuse watts per square meter measured at 613nm wavelength |
| diffuse670((W/m^2)/nm) | Diffuse watts per square meter measured at 670nm wavelength |
| diffuse869((W/m^2)/nm) | Diffuse watts per square meter measured at 869nm wavelength |
| diffuse937((W/m^2)/nm) | Diffuse watts per square meter measured at 937nm wavelength |
| dirnorm(W/m^2) | total of all direct normal radiation including having diffuse light removed, in watts per square meter, adjusted assuming a flat surface oriented perpendicular to the sun rays. |
| dirnorm414((W/m^2)/nm) | Direct watts per square meter measured at 414nm wavelength |
| dirnorm496((W/m^2)/nm) | Direct watts per square meter measured at 496nm wavelength |
| dirnorm613((W/m^2)/nm) | Direct watts per square meter measured at 613nm wavelength |
| dirnorm670((W/m^2)/nm) | Direct watts per square meter measured at 670nm wavelength |
| dirnorm869((W/m^2)/nm) | Direct watts per square meter measured at 869nm wavelength |
| dirnorm937((W/m^2)/nm) | Direct watts per square meter measured at 937nm wavelength |