SOLAR RADIATION TABLES FOR THAILAND

R.H.B. EXELL and K. SARICALI*

Summary: A survey has been made of the geographical, seasonal, and diurnal variations of global solar radiation in Thailand. Seasonal variations of radiation were determined from separate studies for eight 1(1/2) month periods of the year defined by standard solar declination values. The geographical distribution was found from data on the duration of sunshine at 18 stations and from the relation between swtshine and radiation at Chiang Mai and Bangkok. Fluctuations in the daily solar radiation were examined in an unbroken five-year sequence of radiation measurements at Bangkok. The distributwn of radiation levels in the sequence and the transition probabilities between the levels were determined. The distributions of radiation levels elsewhere in Thailand were estimated from daily sunshine measurements. Finally, morning and afternoon radiation amounts at Chiang Mai and Bangkok throughout the year were compared.

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Division of Community and Regional Development, Asian Institute of Technology, P.O. Box 2754, Bangkok.

Received 30 May 1975