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Relationship between “clearness index” and “cloudiness index” at a tropical station (Ilorin, Nigeria)

✍ Scribed by E.B. Babatunde; T.O. Aro

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
328 KB
Volume
6
Category
Article
ISSN
0960-1481

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✦ Synopsis

Total (global)

solar radiation, H, and diffuse solar radiation, Hd, were measured at Ilorin (8 ° 30'N 4 ° 42'E) Nigeria. From these, the daily values of H/Ho and Hd/H were computed, where/4o is the extraterrestrial radiation. The relationship between the two ratios and their variation with the prevailing atmospheric conditions were examined.

The ratios were found to be opposite in characteristics. 11/11o has high values in clear atmospheres and low values in cloudy or turbid atmospheres ; and vice-versa for Hd/H. The two ratios are negatively linearly related and with this fact, two simple mathematical models were obtained for estimating He/H in terms of 1t/11o.

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Hourly and daily clearness index and dif
Hourly and daily clearness index and diffuse fraction at a tropical station, Ile-Ife, Nigeria
✍ E. C. Okogbue; J. A. Adedokun; B. Holmgren 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 312 KB

## Abstract Dataset consisting of hourly global and diffuse solar radiation measured over the period February 1992 and December 2002 have been utilized to investigate the diurnal and seasonal variations of hourly and daily clearness index together with the diffuse fraction at a tropical station Ile