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

Figure 5

A typical air shower seen by the WFCTA fluorescence detectors. Each square marked with a number shows the FOV of each telescope. The open circles in the square represent triggered tubes and the size of each circle is proportional to logarithm of the number of photons. The solid curve crossing the circles represents the projection of a plane containing the shower axis and the detector. Energy (in PeV) and zenith and azimuth angle (in degrees) are displayed at the top.