Abstract
Abstract In 1977 a cooperative research project between the Nordic countries (Denmark, Finland, Iceland, Norwayand Sweden) was started. The objective was to chart the spectral distribution of solar radiation in the Nordicarea with a view to furnish material to agronomists working on the problem of radiation in relation to plantgrowth and crop yield. Radiation was measured with Eppley spectral pyranometers (PSP) equipped with different glass filters,separate UV detectors and PAR cells. Seven stations participated in the project, giving a longitude span from21 .9°W to 26.7°E and a span in latitude from 55.7 to 69.7°N. This paper presents a preliminary report,giving data for the mean monthly values of the global radiation, the spectral energy distribution and itsvariation between the seven Stations. At two stations (Copenhagen and Aas) measurements were performed throughout the year which madeit possible to investigate the annual variation of the spectral distribution. Results show large annual variations,es...
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