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| Souza,Adilson P. de; Escobedo,João F.; Dal Pai,Alexandre; Gomes,Eduardo N.. |
| It was evaluated the annual evolution of global, direct and diffuse components of incident solar radiation on tilted surfaces to 12.85, 22.85 and 32.85º, facing north, in Botucatu, state of São Paulo, Brazil. The radiometric fractions were obtained for each component of the radiation in the aforementioned surfaces, through the ratio with the global and top of the atmosphere radiations. Seasonality was evaluated based on monthly averages of daily values. The measures occurred between 04/1998 and 07/2001 at 22.85º; 08/2001 and 02/2003 at 12.85º; and from 03/2003 to 12/2007 at 32.85º, with concomitant measures in the horizontal surface (reference). The levels of global and direct radiation on tilted surfaces were lower in summer and higher in the equinoxes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solar energy; Clearness index; Atmospheric transmissivity; Climatic conditions. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000200005 |
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| Righi,Evandro Zanini; Heldwein,Arno Bernardo; Maldaner,Ivan Carlos; Lucas,Dionéia Daiane Pittol; Stüker,Paulo Ervin. |
| New coefficients were determined for the weighting term for cloudiness in the Brunt-Penman equation using the rate of solar radiation (RK) in place of the rate of sunshine duration (n/N). The coefficients in the Brutsaert method proposed for daytime in southern Brazil were also tested and adjusted, and the method was selected which gave the more accurate daily results in relation to the original Brunt-Penman equation, for Santa Maria in the state of Rio Grande do Sul, Brazil (RS). Meteorological data covering 2,472 days obtained from the automatic and conventional weather stations in Santa Maria were used. The coefficients were adjusted by linear and nonlinear regression methods depending on the model, using 2/3 of the data. The adjusted equations were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solar radiation; Atmospheric transmissivity; Brunt-Penman equation; Emissivity of the atmosphere. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000100029 |
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| MARTIM, C. C.; ZAMADEI, T.; SOUZA, A. P. de; ALMEIDA, F. T. de; ZOLIN, C. A.. |
| PT-BR: A radiação global (H) e a duração do brilho solar (n) são elementos meteorológicos que contribuem expressivamente para estudos agronômicos, ecológicos e hidrológicos. Na obtenção de H podem ser aplicados diferentes modelos de estimativas baseados em variáveis meteorológicas, todavia, a maneira mais simplificada baseia-se na correlação linear entre a transmissividade atmosférica e a razão de insolação. Objetivou-se obter os coeficientes lineares (a) e angulares (b) da equação de Angström-Prescott e avaliar a sua aplicação nas estimativas de H e da evapotranspiração de referência (ETo), na região de Sinop, MT (transição Cerrado-Amazônia; -11,86°; -55,48° e 371m de altitude), entre 2011 e 2016. Os dados diários foram agrupados em bases mensais,... |
| Tipo: Artigo de periódico |
Palavras-chave: Transmissividade atmosférica; Razão de insolação; Radiação global; Indicativos estatísticos; Atmospheric transmissivity; Sunshine duration; Global radiation; Statistical indicators; Transmisividad atmosférica; Razón de insolación; Radiación global; Indicativos estadísticos; Radiação; Meteorologia; Irradiação; Evapotranspiração; Cerrado. |
| Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1130560 |
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