Volume 501 - 39th International Cosmic Ray Conference (ICRC2025) - Cosmic-Ray Indirect
The Cosmic Ray Event Spectrum in the Knee Region measured by the NICHE Array at Telescope Array
D.R. Bergman*, I. Buckland and  On behalf of the Telescope Array collaboration
*: corresponding author
Full text: pdf
Pre-published on: September 23, 2025
Published on: December 30, 2025
Abstract
The NICHE array at Telescope Array is a non-imaging Cherenkov light detector situated close to the Telescope Array Middle Drum fluorescence detector site. It has been operating since
September 2017. Data collected between June 2020 and July 2024 has been analyzed and we will present the energy spectrum of the cosmic rays observed. The threshold energy of the detector
is about 1 PeV and the data collected gives significant statistics up to about 100 PeV. The energy
reconstruction used in this analysis uses the CHASM model, a model which incorporates extensive air shower universality and Cherenkov photon production.
DOI: https://doi.org/10.22323/1.501.0188
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