PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Indirect, CRI)
Effects of atmospheric transparency on TA air shower analysis
K. Mizuno*, T. Tomida and K. Yamazaki
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Pre-published on: August 17, 2023
Published on:
The Telescope Array (TA) experiment continues to observe Ultra High Energy Cosmic Rays
(UHECRs) both with its original TA detectors as well as with the new TAx4 expansion detectors.
These observations employ Fluorescence Detectors (FDs) to capture the air shower induced by
the primary UHECRs. The FD observes fluorescence light emitted from atmospheric nitrogen
molecules excited by air shower particles. Observation of the FD extends over tens of kilometers,
and the fluorescence light is attenuated by scattering from atmospheric molecules and aerosols
during the propagation process. Seasonal dependence was found when evaluating the attenuation
of fluorescence by aerosols. We will report on the effects of this seasonal dependence on TA air
shower analysis.
DOI: https://doi.org/10.22323/1.444.0226
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