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Simulated and Observed Sunny Line-of-Sight Probabilities at Palehua, Hawaii
AIR FORCE ENVIRONMENTAL TECHNICAL APPLICATIONS CENTER SCOTT AFB IL
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This report documents, a study of the differences in the climatological probabilities of a cloud-free line-of-sight CFLOS at the Palehua, Hawaii, Solar Optical Observatory and the Barbers Point Naval Air Station, about 5 miles southeast of Palehua. The study shows that sunny line-of- sight probabilities SLOS--cloud-free line-of-sight from an observer to the Sun are typically about 10 percent lower at Palehua elevation about 1,700 feet than at Barbers Point 34 feet. The study compared 17 years of actual weather observations from Barbers Point and 5 years Palehua solar optical site status reports Surface weather observations are not available from Palehua. The results of this study suggest that the Stanford Research Institute technique for relating fractional sky-cover and viewing angle to CFLOS probability described by Malick, et al., 1979 is valid for use in Hawaii.
APPROVED FOR PUBLIC RELEASE