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28/07/2026, 10:00
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28/07/2026, 18:00
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29/07/2026, 18:00
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30/07/2026, 11:30
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Prof. Laura Valore (INFN Sezione di Napoli and University of Napoli Federico II)
The attenuation of the fluorescence light in atmosphere due to the presence of aerosols is continuously monitored at the Pierre Auger Observatory with the two distant laser facilites, the Central Laser Facility (CLF) and the eXtreme Laser Facility (XLF). The long-time aerosol attenuation conditions measured in 19 years of operation, and used in the reconstruction of cosmic-ray events...
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Mario Edoardo Bertaina
Mini-EUSO is a telescope launched on board the International Space Station in 2019. Located in the Russian section of the station it has successfully performed so far more than 150 sessions with the aim of remotely sensing our planet from a nadir-facing UV-transparent window in the Zvezda module. The instrument is based on an optical system employing two Fresnel lenses and a focal surface...
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Mrs Shefali Negi (FZU - Insititute of Physics of the Czech Academy of Sciences)
The Angstrom coefficient characterises the wavelength dependence of aerosol extinction and allows the vertical aerosol optical depth (VAOD) measured in one waveband to be extrapolated to others. We determine the Angstrom coefficient using the FRAM (F/Photometric Robotic Atmospheric Monitor) telescopes — small robotic instruments designed for wide-field stellar photometry, currently deployed at...
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Roberto Mussa (INFN Torino)
Horizontal elastic lidar shots towards the Pierre Auger Observatory array, taken every hour, are useful for measuring the homogeneity of the aerosol extinction coefficient at ground level. They also serve to parametrize the relative alignment between laser beam and the mirrors collecting the backscattered light, by studying the variation of the overlap function with azimuth and elevation...
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Markus Gaug (Universitat Autònoma de Barcelona and CERES-IEEC)
Accurate characterisation of the aerosol extinction profile is critical for ground-based gamma-ray observatories, where atmospheric transmittance directly affects the reconstruction of gamma-ray shower energies and the observatory's acceptance. The Cherenkov Telescope Array Observatory (CTAO) requires continuous aerosol profiling with range resolution better than a few hundred metres and...
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Radek Privara (Palacky University Olomouc)
Air shower simulations represent a critical component of data analysis in ground-based, high-energy astroparticle experiments, for which the Fortran-based CORSIKA 7 framework has been widely used. This contribution will present the development status and features of CORSIKA 8, a complete redesign of the simulation framework in the modern C++ language. Special focus will be placed on the...
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Petr Bořil (Palacky University Olomouc, Joint Laboratory of Optics, Czech republic)
This project presents an all-sky cloud monitoring device based on a compact industrial infrared camera. A downward-facing camera observes a convex safety mirror coated with Al + SiO2, enabling thermal observation of the clouds. Such thermal observation, combined with ground-level temperature measurement, allows for cloud base height estimation.
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This contribution will focus on introduction to... -
Eric-Teunis de Boone (Center for Particle Physics Siegen, University of Siegen, Germany)
Lightning-related phenomena are known to interact with and influence all detector systems of the Pierre Auger Observatory. Notably, the Surface Detector has recorded unique signals associated with Terrestrial Gamma Flashes (TGFs) which are rare phenomena linked to the initial processes of lightning. Studying TGFs in coincidence with their parent lightning discharges helps to constrain the...
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Darko Kolar (Center for Astrophysics and Cosmology, University of Nova Gorica)
The Barcelona Raman LIDAR (BRL) system, which is being developed for the Cherenkov Telescope Array Observatory (CTAO) relies on photomultiplier tubes (PMTs) to detect weak optical signals backscattered by atmospheric molecules and aerosols. As aerosol transmission constitutes a major source of systematic uncertainty, efficient photon detection in the LIDAR receiver is essential to achieve the...
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Jakub Šlegl (Nuclear Physics Institute of the CAS)
Cloud electrification models, such as CEM, developed at the Atmospheric Physics Institute of the CAS, take into account atmospheric ionization by cosmic rays. Originally, only fair weather conditions were considered. To expand this, we first tested CEM's response to changes in vertical ionization curves with a change of solar modulation potential and geomagnetic latitude using the CRAC:CRII...
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Jake McMillan (Durham University)
We present KODIAK (Kolmogorov Observations of Dynamic In-situ Atmospheric Kinematics), a low-SWaP-C atmospheric characterisation instrument that provides high-resolution, in-situ measurements of turbulence, aerosol and molecular composition, and optical transparency. Designed primarily as a UAV-integrated payload, KODIAK enables rapid and flexible atmospheric profiling in environments...
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Thara Rubi Caba Pineda (KIT)
The Atmospheric Lidar (ATLID) onboard the Earth Cloud, Aerosol and Radiation Explorer (EarthCARE) has been repeatedly observed by the Fluorescence Detectors of the Pierre Auger Observatory. Side-scattered ultraviolet light from ATLID laser pulses is recorded by the Auger fluorescence telescopes, which are primarily designed to measure the longitudinal development of extensive air showers...
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Mario Pecimotika (Department of Polytechnics, Dr. Franjo Tuđman Defense and Security University, Zagreb, Croatia)
We report on gamma-ray observations of the binary black hole (BBH) merger candidate S241125n, detected by the LIGO-Virgo-KAGRA Collaboration during the O4b observing run. Follow-up observations were performed with the MAGIC telescopes and the Large-Sized Telescope prototype (LST-1) of the Cherenkov Telescope Array Observatory. S241125n is of particular interest due to its temporal and spatial...
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Georgios Voutsinas (University of Geneva)
The performance of Imaging Atmospheric Cherenkov Telescopes (IACTs), such as the Cherenkov Telescope Array Observatory (CTAO), depends critically on atmospheric conditions, which govern both air-shower development and Cherenkov light transmission. In this contribution, we focus on the latter. In the first part, we investigate seasonal and Stratosphere to Troposphere exchange-driven variations...
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Dario Hrupec (Department of Physics Josip Juraj Strossmayer University of Osijek)
The next generation of imaging atmospheric Cherenkov telescopes, in particular the four LSTs (Large-Sized Telescopes) of the CTAO (Cherenkov Telescope Array Observatory), will provide substantially improved sensitivity compared to previous instruments. This increased sensitivity also makes precise atmospheric characterization more important, since even moderate atmospheric disturbances can...
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Doramas Jimeno Sanchez (Deutsches Elektronen-Synchrotron DESY)
Muons created in extensive air showers in the lower atmosphere can leave ring-like traces in the images recorded by imaging atmospheric Cherenkov telescopes (IACTs). These traces can be used to monitor the optical throughput of an IACT via the so-called muon efficiency, a parameter calculated from the radius and brightness of these ring-like traces.
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The standard calibration chain of the... -
Vlastimil Jílek (Joint Laboratory of Optics)
For astroparticle projects that utilize the Earth's atmosphere as a calorimeter for detecting cosmic rays, real-time knowledge of atmospheric conditions and optical properties is essential. The ceilometer, a commercial meteorological lidar typically used for measuring cloud base height, vertical visibility, and cloud cover, represents a robust tool for characterizing the aerosol content of the...
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Martin Kákona (Nuclear Physics Institute of the CAS)
In 2025, the THUNDERMILL02 Electric Field Mill (EFM) instruments were deployed at two high-altitude mountain observatories: Basic Environmental Observatory Musala in Bulgaria (2925 m a.s.l.) and Observatory Lomnický štít, Slovakia (2634 m a.s.l.), complemented by mobile measurement campaigns in the Czech Republic. This contribution presents the first year of operational experience and selected...
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Vincenzo Rizi (DSFC/UNIVAQ and INFN-LNGS)
Accurate, height-resolved atmospheric characterization is a critical requirement for the reconstruction of extensive air showers and Cherenkov light in ground-based high-energy astroparticle observatories. Raman lidar systems, based on Nd:YAG laser emitters and elastic plus inelastic (Raman) detection channels, provide direct measurements of vertical profiles of aerosol extinction and...
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Roberto Mussa (INFN Torino)
The Fluorescence Detector of the Pierre Auger Observatory, beyond its primary focus on cosmic rays, has proved to be a unique facility for the observation of ELVES and HALOS with unprecedented time resolution. Starting on December 2023, to complement these observations, we installed three cameras (TLEcams) to record a larger variety of TLEs with higher space resolution and longer integration...
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Dr Georges Vasileiadis (CNRS/LUPM)
The Montpellier Raman Lidar is a prototype in its final form, designed and built to fulfil the requirements of CTAO. It will provide atmospheric profiles at 355, 387, 532, and 607 nm. It incorporate two distinctive design elements, a gated photomultiplier protocol to avoid excessive light coming from very low altitudes and an automatic alignement system. It is ment to be installed at the...
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ALEXANDR KOSTINSKIY (Nuclear Physics Institute of the Czech Academy of Sciences)
At present, it is impossible to explain the mechanism of lightning initiation in thunderclouds without considering the key role of powerful discharges that occur 0.04–3 ms after the lightning initiation. These discharges are termed Initial Breakdown Pulses (IBPs), and their peak currents are comparable to the high currents of lightning return strokes to the ground [Rakov & Uman, 2003].
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