Artigo Acesso aberto Produção Nacional Revisado por pares

Determinação dos coeficientes da equação de Angstron para a região de Palotina, Estado do Paraná

2004; Editora da Universidade Estadual de Maringá (Eduem); Volume: 26; Issue: 3 Linguagem: Inglês

10.4025/actasciagron.v26i3.1831

ISSN

1807-8621

Autores

Rivanildo Dallacort, Paulo Sérgio Lourenço de Freitas, Antônio Carlos Andrade Gonçalves, Roberto Rezende, Altair Bertonha, Frederico Fonseca da Silva, Marcos Trintinalha,

Tópico(s)

Geography and Environmental Studies

Resumo

This work aimed at adjusting the Angstron’s equation coefficients, on monthly and annual basis, to the region of Palotina (24º17'S, 53º50'30'' W and 333m of altitude), Paraná, Brazil. The purpose was to determine the global solar radiation on a daily basis. Climatic data of global solar radiation and total daily sunshine, from 1982 to 2002 were used to fit the equation. Lower values (7,82MJ m-2) of global solar radiation were verified at months with north solar declination and higher values (22,07MJ m-2) at months with south solar declination, with annual mean value of 14,27MJ m-2. The radiation that reached the atmosphere top presented similar annual trend, with a lowest value of 21,58MJ m-2 on June 24th and highest value of 44,51MJ m-2 on January 1st. Annual mean value was of 33,45MJ m-2. Higher value of insolation ratio were obtained in the winter and lower values occurred in the summer, ranging from 0,13 to 0,97, with 0,58 as a mean value. The brightness index ranged from 0,32 to 0,55, and 0,55 constitute the maximum brightness index for the region of Palotina, Paraná

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