SERI QC currently uses a fixed offset among the three regimes, allowing for a single number to represent all three airmasses. Although there is a general and unmistakable attenuation in the Kt and Kn maximums during a change from low airmass to either medium airmass or high airmass, the magnitude of the change is inconsistant among various station geographic locations and time of year. Thus, a single characteristic attenuation factor rarely provides the optimal fit for historical data at a site.
With new QA-zero file format, a specific maximum is now determined in QCFIT for each airmass and month. Both QCFIT and SERI QC codes are modified.
In the modified QCFIT code (curve fitting function), the lines for throttling are discarded and Kn/Kt maximum values for each airmass defined from QA-zero file are used as they are.
SERI QC currently uses a fixed offset among the three regimes, allowing for a single number to represent all three airmasses. Although there is a general and unmistakable attenuation in the Kt and Kn maximums during a change from low airmass to either medium airmass or high airmass, the magnitude of the change is inconsistant among various station geographic locations and time of year. Thus, a single characteristic attenuation factor rarely provides the optimal fit for historical data at a site.
With new QA-zero file format, a specific maximum is now determined in QCFIT for each airmass and month. Both QCFIT and SERI QC codes are modified.
In the modified QCFIT code (curve fitting function), the lines for throttling are discarded and Kn/Kt maximum values for each airmass defined from QA-zero file are used as they are.