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Abstract

The contract programme consists of three parts: I Improvement of radiation network II Installation of equipment to measure the separate components of global solar radiation on a vertical south facing surface III A statistical analysis of the components of solar radiation on a vertical south facing surface. In the latter, measured hourly values of the diffuse and ground reflected radiation components on a vertical south facing surface at Valentia Observatory are compared with the theoretically expected values and are analyzed mainly with respect to solar elevation (E) and to D-R/G. The ratios of the observed to the theoretically expected (1) diffuse radiation (F-R) and (2) reflected radiation (K) were computed for each hour and compared with 1 - D-D/G for 5 degrees ranges of elevation (E) and declination (delta). An analysis of the ratio F-R shows a linear relationship with the relative duration of bright sunshine, represented by 1 - D-R/G for a given E and delta. The analysis further showed that the angle of incidence of the radiation on the southfacing surface (beta) was an important factor. A linear equation was found for K, similar to that for F-R but the correlation coefficients were not nearly as good.

Additional information

Authors: MURPHY E J, IRISH METEOROLOGICAL SERVICE, DUBLIN (IRELAND);COMMINS K G IRISH METEOROLOGICAL SERVICE, DUBLIN (IRELAND), IRISH METEOROLOGICAL SERVICE, DUBLIN (IRELAND)
Bibliographic Reference: EUR 8909 EN (1984) MF, 33 P., BFR 120, BLOW-UP COPY BFR 165, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989122055600 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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