Abstract
Regression fits between monthly average values of daily diffuse irradiation and bright sunshine duration have been obtained for monsoon, pre- and post-monsoon periods, collectively for stations in (1) the zone comprising arid and semi-arid regions and (2) the wet-and-dry zone in north and central India. Long-term data of eight stations situated near 20°N lat have been employed. The root mean square (r.m.s.) errors of the fits are between 3 and 7%. The present station-independent correlations do not require data on global radiation and provide highly satisfactory estimates of diffuse irradiance from sunshine duration. The technique of making collective fits, depending on seasons and climatic regions, may well be applied to different parts of the world with much advantage.
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