The image shows a formula CI = Hm / Hcs and text related to an average insolation levels model. It seems to be a question related to physics or engineering.

Here are the objectives related to the Clearness Index (CI) model as presented in the image:

• To define and calculate the Clearness Index (CI) using the ratio of measured insolation ($H_m$) to clear-sky insolation ($H_{cs}$).
• To utilize the Clearness Index (CI) as a quantitative measure of atmospheric attenuation of solar radiation.
• To integrate the Clearness Index (CI) into methodologies for assessing and mapping average insolation levels.
• To analyze the spatial and temporal variability of atmospheric effects on solar radiation by examining the Clearness Index (CI).