A Satellite-Based Sky Luminance Model for the Tropics

Table 2

Example of the absolute sky luminance (L) of some subzones indicated by zenith angle (Z) and indicatrix angle (𝜒) for solar zenith angle (𝑍_𝑠) of 55°–60° with different values of cloud index (n).

	L (Z, χ) (kcd/m^2)
	𝑛=0			𝑛=0.5			𝑛=1
	𝜒=30^∘	𝜒=45^∘	𝜒=60^∘	𝜒=30^∘	𝜒=45^∘	𝜒=60^∘	𝜒=30^∘	𝜒=45^∘	𝜒=60^∘
𝑍=30^∘	7.79	4.82	3.18	11.52	7.94	5.97	7.55	5.88	5.08
𝑍=45^∘	9.31	5.56	3.74	12.17	8.53	6.68	7.94	6.22	5.36
𝑍=60^∘	11.40	7.22	4.90	12.37	8.91	7.06	7.72	6.10	5.41