A Comparison of Models for Estimating Solar Radiation from Sunshine Duration in Croatia

Table 1

The original and adjusted coefficients (marked with apostrophe) for Dogniaux-Lemoine (Model 16) and Soler (Model 17) models.

Model	Coeff.	Month
		1	2	3	4	5	6	7	8	9	10	11	12
Model 16		-0.00301	-0.00255	-0.00303	-0.00334	-0.00245	-0.00327	-0.00369	-0.00269	-0.00338	-0.00317	-0.00350	-0.00350
		-0.008	-0.008	-0.00378	-0.00621	-0.00540	-0.00754	-0.00360	-0.00338	-0.00104	-0.00101	-0.00799	-0.008
		0.34507	0.33459	0.36690	0.38557	0.35057	0.39890	0.41234	0.36243	0.39467	0.36213	0.36680	0.36262
		0.5858	0.5859	0.2804	0.4176	0.3622	0.5025	0.2713	0.2636	0.1378	0.2785	0.4791	0.553
		0.00495	0.00457	0.00466	0.00456	0.00485	0.00578	0.00568	0.00412	0.00564	0.00504	0.00523	0.00559
		0.001	0.001	0.001	0.00461	0.00667	0.00206	0.00737	0.008	0.00799	0.008	0.001	0.001
		0.34572	0.35533	0.36377	0.35802	0.33550	0.27292	0.27004	0.33162	0.27125	0.31790	0.31467	0.30675
		0.4188	0.4589	0.7707	0.5193	0.4554	0.5752	0.3886	0.3327	0.4118	0.102	0.6913	0.5221
Model 17		0.18	0.20	0.22	0.20	0.24	0.24	0.23	0.22	0.20	0.19	0.17	0.18
		0.2051	0.1996	0.0822	0.099	0.106	0.102	0.1236	0.1481	0.1151	0.2505	0.0944	0.1705
		0.66	0.60	0.58	0.62	0.52	0.53	0.53	0.55	0.59	0.60	0.66	0.65
		0.5387	0.5879	0.8808	0.808	0.7812	0.7698	0.6982	0.6474	0.7256	0.4203	0.8186	0.6361