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O presente trabalho apresenta equacoes de estimativa da radiacao fotossinteticamente ativa global ( ) e difusa ( ) em funcao das respectivas radiacoes global ( ) e difusa ( ) do espectro solar total, bem como a estimativa da fracao PAR difusa da PAR global ( ) em funcao do indice de transmissividade atmosferica ( ). A base de dados foi adquirida no periodo de 01/06/1999 a 31/09/2000 na Estacao de Radiometria Solar da FCA-UNESP, Botucatu. Foram utilizados dados adicionais, diferentes dos utilizados na geracao dos modelos, de forma a possibilitar uma validacao adequada dos modelos propostos. UNITERMOS: radiacao fotossinteticamente ativa global e difusa, transmissividade atmosferica, modelos de estimativa da radiacao solar. GOMES, E.N., ESCOBEDO, J.F MODELS FOR GLOBAL AND DIFFUSE PHOTOSYNTHETICALLY ACTIVE RADIATION IN RELATION TO GLOBAL, DIFFUSE RADIATION AND CLEARNESS INDEX . 2 SUMMARY This work describes typical correlations between global solar radiation ( ) and its global PAR component ( ), diffuse solar radiation ( ) and its diffuse PAR component ( ), clearness index ( ) and the diffuse PAR fraction of global PAR ( ). Database was recorded from June 1 st 1999 to September 31 st 2000 at the Solar Radiometric Station, Botucatu, SP. Additional data which are not part of the model development were used to validate each proposed model. KEYWORDS: global and diffuse photosynthetically active radiation, clearness index, estimating models.

MODELOS DE ESTIMATIVA DA RADIAÇÃO FOTOSSINTETICAMENTE ATIVA GLOBAL E DIFUSA EM FUNÇÃO DA RADIAÇÃO DE ONDAS CURTAS E DO ÍNDICE DE CLARIDADE (Kt)