Solar radiation at the ground surface [kJ m-2 d-1]
Solar(lat, Jday, Tx, Tn, albedo=0.2, forest=0, slope=0, aspect = 0,
units="kJm2d", latUnits = "unknown", printWarn=TRUE)latitdue [rad]
Julian date or day of the year [day]
maximum daily temperature [C]
minimum daily temperature [C]
surface albedo or reflectivity [-]
forest or vegeation cover [-]
slope of the ground [rad]
ground aspect [rad from north]
Units of the result. Defaults to kJ/m2/d, changing this to "Wm2" will make output in W/m2
Latitude units can be explicitly stated here, options are 'radians', 'degrees' or default is 'unknown', which will assume radians unless the absolute value of lat is greater than pi/2
Will print a warning about latitude if set to TRUE