J. Waewsak and C. Chancham (Thailand)
Solar Radiant, Angstrom’s Equation, Rainfall Amount,Sunshine Hour, and Extraterrestrial Solar Radiation
The objective of this paper is to present the spatial distribution and temporal variability of solar radiant over southern Thailand. The incident of solar radiation on a horizontal plane was estimated at 14 synoptic stations using the Angstrom’s correlationship which was obtained from meteorological data. The rainfall amounts at three main meteorological stations i.e. Surat Thani airport, Phuket airport and Hat Yai airport were proposed to correlate to the sunshine hours and therefore to predict them in meteorological stations where sunshine recorders were absent and rainfall data were present. The Angstrom’s correlation coefficients (a and b) were obtained using the correlation between the sunshine hour and day length. After the extraterrestrial solar radiation was known, the solar radiant was obtained. The spatial distribution and temporal variability of solar radiant over southern Thailand was performed using SURFER computer software. It was found that the solar radiant over southern Thailand varied in the range of 12.51-24.54 MJ/m2 -day. Finally, it was clearly revealed that the temporal variation of solar radiant over southern Thailand greatly depended on the influence of the North-East and South-West monsoons.
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