Analysis of EAS-like events detected by the Mini-EUSO telescope
Matteo Battisti, Mario Bertaina, Enrico Arnone, Gaetano Sammartino,, Giulia Pretto

TL;DR
This paper analyzes EAS-like events detected by Mini-EUSO on the ISS, distinguishing between cosmic-ray induced events and other atmospheric or ground-based phenomena, validating the detection principle for space-based UHECR observation.
Contribution
It demonstrates that Mini-EUSO can differentiate between UHECR-induced events and other transient phenomena, confirming the detection principle for future space-based cosmic-ray observatories.
Findings
Most EAS-like events are ground-based flashes triggered repeatedly.
Some non-repeated events are not of cosmic origin and are classified as SLTs.
The analysis confirms the ability to distinguish UHECR events from other atmospheric phenomena.
Abstract
The Mini-EUSO telescope is the first space-based detector of the JEM-EUSO program. It was launched for the International Space Station on August 22, 2019 to observe from the ISS orbit (420 km altitude) various phenomena occurring in the Earth's atmosphere through a UV-transparent window located in the Russian Zvezda Module. The dimension of the window defines and constrains the dimension of the optics, based on a set of two Fresnel lenses of 25 cm diameter each, almost two orders of magnitude smaller than the system foreseen for a larger space-based detector, like the original JEM-EUSO detector or the future POEMMA. As a consequence, the energy threshold of Mini-EUSO is very high, above eV. Nevertheless, a series of events that resemble the shape and the time duration of EAS-induced events have been detected in Mini-EUSO data. This contribution presents the most…
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