The charged particles in an air shower also interact with atmospheric nitrogen, causing it to emit ultraviolet light via a process called fluorescence, which is invisible to the human eye - but not to the Auger Observatory's optical detectors. Using a grid of focusing mirrors to collect the light, cameras can view the air shower up to 15 kilometers away.

Searched words: Video: Inside a Fluorescence Detector Building, Admin, This email address is being protected from spambots. You need JavaScript enabled to view it., The charged particles in an air shower also interact with atmospheric nitrogen, causing it to emit ultraviolet light via a process called fluorescence, which is invisible to the human eye - but not to the Auger Observatory's optical detectors. Using a grid of focusing mirrors to collect the light, cameras can view the air shower up to 15 kilometers away.