Simple Solar Spectral Model for Direct and Diffuse Irradiance on Horizontal and Tilted Planes at the Earth's Surface for Cloudless Atmospheres

Table 3-1. Diffuse Irradiance (W m^-2 µm^-1) at Selected Wavelengths Calculated
Using the BRITE Code, the Justus and Paris Code, and the Modified Justus and
Paris Code. (Model parameters for (a) and (b) are = 1.14,
ground albedo = 0.2, O₃ = 0.344 atm-cm, and H₂0 = 1.42 cm.)

	BRITE (1)	Justus/ Paris (2)	Modified Justus/Paris (3)	Ratio, 2/1a	Ratio, 3/1b
(a) = 0.27, Z = 60°
0.31	11.9	25.5	17.7	2.14	1.49
0.35	172.6	243.3	174.5	1.41	1.01
0.4	307.2	343.5	268.5	1.12	0.87
0.45	382.7	419.8	368.0	1.1	0.96
0.5	306.6	351.8	317.0	1.15	1.03
0.55	260.6	301.3	278.1	1.16	1.07
0.71	173.6	169.7	163.9	0.98	0.94
0.78	141.9	130.0	126.7	0.92	0.89
0.9935	51.9	60.4	59.8	1.16	1.15
2.1	1.85	2.3	2.3	1.24	1.24
(b) = 0.51, Z = 80°
0.31	0.28	0.34	0.26	1.21	0.93
0.35	37.9	71.2	56.8	1.88	1.5
0.4	80.3	114.8	92.8	1.43	1.16
0.45	125.2	160.8	133.6	1.28	1.07
0.5	126.0	149.3	122.6	1.18	0.97
0.55	115.0	135.0	113.3	1.17	0.99
0.78	81.0	89.5	83.9	1.1	1.04
0.9935	44.6	48.2	47.0	1.08	1.05

^a Ratio of Justus and Paris data (2) to BRITE data (1).

^b Ratio of Modified Justus and Paris data (3) tp BRITE data (1).

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