On the evaluation of natural illumination from pyrheliometric measurements in India |
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| Authors: | Murari Lal H S Rathor |
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| Institution: | (1) Department of Geophysics, Banaras Hindu University, Varanasi-5, India |
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| Abstract: | Summary The technique for evaluating the natural illumination of direct solar radiation introduced byÅngström andDrummond 1]2) has been applied by the authors to the pyrheliometric observations in India and the values of natural illumination derived at eight representative stations are presented in this paper. The dirunal and seasonal variations of the illumination fluxes have been discussed. —In general, illumination fluxes in India show a maximum during summer season except at Madras, where the maximum occurs during winter. The illumination fluxes at various stations vary within the range 80–110 kilolux throughout the year. However, at Calcutta, it varies within a rather narrow range of 65–85 kilolux. Both in summer and winter, the illumination flux during forenoon hours is usually more than that during afternoon hours. An increase in daylight illumination is observed with height of the station above sea level. |
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