Automated Calibration

Plot showing automatically selected cleark-sky data points, using Long and Ackerman algorithm Those automatically selected cleark-sky data points on the Langley plot
Global solar SURFRAD measurements marked with * in the daily time series above were identified as times of cloud-free skies. The afternoon clear-sky times are cross referenced with coincident MFRSR data to produce the calibration Langley plot on the right. Blue points are MFRSR 500 nm measured MFRSR voltages that correspond to the afternoon cloud-free times on the plot to the left.

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