Global Solar Radiation Models in Minas Gerais, Southeastern Brazil

Table 2

Empirical models used to estimate global solar radiation for locations in Minas Gerais.

Abbreviation	Equation	Reference
AP		[43, 44]
HS		[45]
Hg		[46]
Nw		[47]
AE		[48]
JS		[49]
Hn		[30]
AD		[50]
Gd		[51]
EM		[52]
EY		[53]
Ws		[54]
Ch		[55]

is the global solar radiation (MJ·m⁻²day⁻¹); is the extraterrestrial solar radiation (MJ·m⁻²day⁻¹), given by , where is the correction of the Earth-Sun distance (dimensionless), given by ; is the day of the year, between 1 (January 1) and 365 (December 31); is the sunset hour angle (degrees), given by ; is the latitude (degrees); is the solar declination (degrees), given by ; is the maximum daily temperature (°C); is the minimum daily temperature (°C); is the maximum possible daily sunshine duration (hours); is the daily sunshine duration (hours); is the daily precipitation (mm); is the thermal amplitude (°C), given by ; are the calibration empirical coefficients (dimensionless).