Publication and Distribution The World Radiation Data Centre has been publishing surface radiation data collected from the world radiometric network. The issue is "Solar Radiation and Radiation Balance Data. The World Network" presenting data in tabular formats. The first monthly issue appeared in 1964. Since 1993 the publication has been issued four times a year. Distribution of "Solar Radiation and Radiation Balance Data. The World Network" bulletins has been organized among the national meteorological services and other institutions responsible for submission of solar radiation data to the WRDC.