TY  - JOUR
T1  - Diurnal and Seasonal Variations of Global Solar Radiation at Akure, South-Western Nigeria
AU - , S.E. Falodun AU - , E.O. Ogolo 
JO  - Journal of Engineering and Applied Sciences
VL  - 2
IS  - 1
SP  - 125
EP  - 128
PY  - 2007
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2007.125.128
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2007.125.128
KW  - Global solar radiation
KW  -spectral irradiance
AB  - The diurnal and seasonal variations of mean Global radiation have been studied by analyzing two years data measured at the ground surface in a tropical station, Akure (7.150N, 5.120E), in Nigeria. The maximum mean Global solar radiation (which occurs around 14:00 LT ) varies in the course of the year from 512 Wm <SUP>2</SUP> in the wet season (April-october) to 543 Wm <SUP>2</SUP> in the dry season (Nov-March). The low values (and large fluctuations) of the hourly mean values recorded during the wet season are attributed to the important roles that the convective clouds and water vapour play in the atmospheric radiation budget, which is very pronounced in the tropical areas of west Africa. The daily amplitude of the Global radiation is larger for the dry season (maximum in November) than it is for the wet season (maximum in July). A lag of about 2 h is also observed between the times when the maximum of the air temperature and the mean Global radiation courses occur over the area.
ER  -