# ICRC 2021

Jul 12 – 23, 2021
Online
Europe/Berlin timezone

## Cosmic Ray Energy Spectrum measured by the TALE Fluorescence Detector

Jul 14, 2021, 12:00 PM
1h 30m
03

#### 03

Poster CRI | Cosmic Ray Indirect

### Speaker

Tareq AbuZayyad (Loyola University Chicago; University of Utah)

### Description

The Telescope Array (TA) cosmic rays detector located in the State of Utah in the United States is the largest ultra high energy cosmic rays detector in the northern hemisphere. The Telescope Array Low Energy Extension (TALE) fluorescence detector (FD) was added to TA in order to lower the detector's energy threshold, and has succeeded in measuring the cosmic rays energy spectrum and mass composition down to PeV energies. In this contribution we describe the measurement of the cosmic ray energy spectrum using $\sim4$ years of TALE FD data. The energy spectrum shows features consistent with the "knee" and the "second knee".

### Keywords

Cosmic Rays; Galactic Extra-Galactic Transition; Knee

Collaboration Telescope Array Experimental Results

### Primary authors

Tareq AbuZayyad (Loyola University Chicago; University of Utah)