Observing Network	The STAR group makes continuous measurements of surface radiation quantities at several field sites around the world. The individual sites have varying characteristics and attributes and, therefore, are involved in different projects and applications. Further information about the individual sites is given here.
Measurements & Instruments	Upwelling and downwelling broadband solar and thermal irradiances are measured as well as relative spectral direct solar measurements for purposes of determining aerosol optical depth and precipitable water are also made. For information on the measurements at the field sites and the instruments used click here.
Data	Data collected from measurements at the observing network are centrally collected and processed in our Boulder office by the STAR staff. Information on the available data is given here.
Research Projects	The data collected from the observing network is used by the STAR group and its collaborators in a wide variety of research projects, primarily related to climate variability and forcing. In addition, some projects are conducted independently of the field network but relate to the common topic of radiation and climate. Further information about STAR's projects is given here.