Summary
The relationship between (Q) total solar radiation, as measured by a solarimeter, and hours of bright sunshine (n), as measured by a Campbell-Stokes recorder, has been examined on a monthly basis for three tropical stations Madras, Waltair and Nagpur. The regression equations relating the data are calculated in the non-dimentional form of Ångström type
whereQ A is the maximum possible radiation andN in the maximum possible duration of bright sunshine. The individual regression relationships for the three stations are also verified; the agreement between the computed values and observed solar radiation is good. It has been shown that the slope of the relationshipb is approximately constant, while the value ofa is a function of latitude. An empirical relationship leading to the Ångström equation at latitude θ over the range 0°–60° as derived byGlover andMcCulloch [13]2) gives values in reasonable accord. A combined equation for the three stations of the form
has been presented. The sum ofa andb has been shown to lie around a mean of 0.77, in good agreement with the other workers.
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Viswanadham, Y., Ramanadham, R. The relation between solar radiation and hours of bright sunshine at some tropical stations. PAGEOPH 74, 186–194 (1969). https://doi.org/10.1007/BF00875197
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DOI: https://doi.org/10.1007/BF00875197