Resolution No.5 (1991): Global observation network of UV spectra

IAGA recognising the need to understand the UV radiation environment and the processes that control it, including the changes in total column ozone, and to investigate the response of the biosphere, recommends that national funding agencies support the establishment of a global observation network to determine the present day distribution of UV spectra at the Earth's surface and to detect long term (decade) trends, based upon standardised algorithms and instrument calibration.