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1. Ultra High Energy Particles

   Linked via "Fluorescence telescopes"

   Fluorescence Telescopes
   Fluorescence telescopes employ large mirror systems to capture the faint ultraviolet (UV) light emitted when atmospheric nitrogen molecules are excited by the passage of the EAS. This technique is highly sensitive to the depth of shower maximum ($X_{\text{max}}$).
   The $X_{\text{max}}$ value is crucial for determining the primary particle's mass. Heavier nuclei induce [el…