Direct Beam Radiation from Global Radiation for Jodhpur (India)

The direct beam radiation has been correlated with global radiation because it was seen that beam radiation has a strong correlation with global radiation. By using regression technique, based on least square method, correlations between beam ratio and global ratio, in the form of K_B = f (K_T) on daily basis, have been determined. It has been seen that seasonal correlations yield better results for Jodhpur (Latitude 26.3°N; Longitude 73°E). The root mean square error for this station found to be around 5% for the three seasons summer, winter and spring/autumn.