Determining regression constants for calculating global solar radiation at Jharkhand (India) region

Since, the Jharkhand (India) region passes through the Tropic of Cancer, it is an ideal location to benefit the advantages of solar energy development and implementation of its related technologies. In this communication, an effort has been made to develop a linear regression model for predicting solar radiation in Jharkhand region. Taking sun-sine hours as the prime concern, the three main places which comes under this region namely - Jamshedpur (longitude86°ll E, lattitude22°48 N), Ranchi (longitude85°20 E, lattitude23°21 N) and Bokaro (longitude86°09 E, lattitude23°40 N) a set of Angstrom constants were obtained and averaged in order to develop the linear regression model. The new develop model estimated the value of `a' which is ranging between 0.203 to 0.211 and values of `b' ranging from 0.489 to 0.514.