Simulating a Measurement of the 2nd Knee in the Cosmic Ray Spectrum with an Atmospheric Fluorescence Telescope Tower Array

Figure 4

Profiles of all photons along with the shower longitudinal development that were produced by a shower in simulation. The solid curve represents the sum of all photons. The short-dot-dashed curve represents fluorescence photons. The long-dot-dashed curve represents direct Cherenkov components. The dashed curve represents Cherenkov photons scattered by aerosols. The lowest dotted curve represents Cherenkov photons scattered by atmospheric molecules (Rayleigh scattering). The range between two vertical lines is covered by FD1.