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Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - CRI - Cosmic Ray Indirect
EUSO-TA ground based fluorescence detector: analysis of the detected events
F. Bisconti,* J.W. Belz, M.E. Bertaina, S. Blin-Bondil, F. Capel, M. Casolino, T. Ebisuzaki, J. Eser, P. Gorodetzky, J.N. Matthews, E. Parizot, L.W. Piotrowski, Z. Plebaniak, G. Prevôt, M. Putis, H. Sagawa, N. Sakaki, H. Shin, K. Shinozaki, P. Sokolsky, Y. Takizawa, Y. Tameda, G.B. Thomson
*corresponding author
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Pre-published on: 2019 July 22
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Abstract
EUSO-TA is a ground-based florescence detector built to validate the design of an ultra-high energy cosmic ray fluorescence detector to be operated in space. EUSO-TA detected the first air shower events with the technology developed within the JEM-EUSO program. It operates at the Telescope Array (TA) site in Utah, USA. With the external trigger provided by the Black Rock Mesa fluorescence detectors of Telescope Array (TA-FDs), EUSO-TA observed nine ultra-high energy cosmic ray events and several laser events from the Central Laser Facility of Telescope Array and portable lasers like the JEM-EUSO Global Light System prototype. The reconstruction parameters of the cosmic ray events which crossed the EUSO-TA field of view (both detected and not detected by EUSO-TA), were provided by the Telescope Array Collaboration. As the TA-FDs have a wider field of view than EUSO-TA (~30 times larger), they allow the cosmic ray energy reconstruction based on the observation of most of the extensive air-shower profiles, including the shower maximum, while EUSO-TA only observes a portion of the showers, usually far from the maximum. For this reason, the energy of the cosmic rays corresponding to the EUSO-TA signals appear lower than the actual ones. In this contribution, the analysis of the cosmic-ray events detected with EUSO-TA is discussed.
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