A Satellite-Based Sky Luminance Model for the Tropics

Figure 8

The plot of 𝑓(𝜒)/𝑓(𝜒_ref) versus 𝜒 for different values of solar zenith angle (𝑍_𝑠) for the case of cloud index 0≤𝑛≤0.1. 𝜒 is the indicatrix angle of the sky subzone.