Maps showing the distribution of solar radiation over New Guinea and adjacent islands have been prepared for January, April, July and October and for the year as a whole. These maps are based on a modified Angström equation, Q = QA (0.25 + 0.55 n/N), derived from data for Port Moresby, Rabaul and Djajapura-Sentani, which was applied to sunshine data for 38 stations and cloud cover data for another 12 stations. The maps presented show considerably more detail than the world maps and regional maps published so far. Although based on sparse data, the distribution patterns found are consistent with published patterns of related climatic variables.
J. D. Kalma (Thu,) studied this question.