7-Days of Solar Insolation at the Durham Treatment Facility
Data are downloaded and processed every 3 hours.
The Durham Treatment Facility is located near the intersection of Hall Blvd and Durham Road in Tigard, Oregon. A quantum sensor on the roof of the facility measures photosynthetically active radiation (PAR) in the 400 to 700 nanometer wavelenth band, in units of microEinsteins per square meter per second. These data are converted to Watts per square meter, then to full-spectrum radiation with a regression developed from other data.
Hourly data are averages of 60 individual measurements taken each minute over the previous hour. The 7-day and 30-day averages shown in the graph are plotted as means for the previous 7- or 30-day time period. If the 7-day or 30-day lines are not plotted, it is due to missing data in that period.
These data are provisional and are subject to revision.
Graph updated: Thursday - Jun 21, 2018 at 14:53:05 EDT