Relations between net radiation, global solar radiation, and sunshine on the north coast of New South Wales

Data collected at Wollongbar on the north coast of New South Wales were used to establish the relation Qn = 118 + 0.635 Qt - 714 Qt/Qe for predicting net radiation (Qn)from daily measurements of global solar radiation (Qt) and tabulated values of extraterrestrial radiation (Qe), expressed in units of J cm-2 d-1. The inclusion of the atmospheric transmissivity term (Qt/Qe) in the relation increased the amount of explained variation in from 79 to 85 per cent. The data were collected over a green grass sward with an albedo of 0.23.