1. A Study of the Elongation Rate and Air Shower Properties of Ultra High Energy Cosmic Rays from the Southern Pierre Auger Observatory Open Access Author: Atulugama, Buddhika Sanjeevi Kumari Title: A Study of the Elongation Rate and Air Shower Properties of Ultra High Energy Cosmic Rays from the Southern Pierre Auger Observatory Graduate Program: Physics Keywords: Extensive Air ShowersMass CompositionElongation RateUltra High Energy Cosmic RaysEnergy Estimator File: Download Atulugama_thesis.pdf Committee Members: Stephane Coutu, Committee Chair/Co-ChairPaul Sommers, Committee Chair/Co-ChairRichard Wallace Robinett, Committee MemberJane Camilla Charlton, Committee Member