Case of clear night: Atmospheric calibration main method
Summary
In discussions with Roberta, we found that a separate Use Case "Clear night" shall be created.
This Use Case shall correspond to those parts of the data, which show minimum aerosol extinction, in the sense that the systematic error between using the standard default clear-night simulation case and the actual observed conditions result to be smaller than the maximum systematic error allowed.
Under such conditions, no further corrections shall be made to the atmospheric part of the simulations and clear-night IRFs can be directly used.
A dedicated requirement for this case will be issued soon.