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Mario Pecimotika (University of Rijeka, Faculty of Physics)13/07/2022, 09:30
The Cherenkov Telescope Array (CTA) is the next generation ground-based observatory for gamma-ray astronomy at very-high energies which will consist of the northern (CTA-N, La Palma, Spain) and southern (CTA-S, Paranal, Chile) arrays. The atmosphere, as an integral part of the Cherenkov telescope detector, has a great impact on the observed data, especially in means of reduced sensitivity. One...
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Jan Ebr13/07/2022, 10:00
Wide-field stellar photometry – the process of simultaneous comparison of apparent and catalog brightness of a large amount of stars – has long been a promising method of atmospheric monitoring, as it can provide atmospheric transparency measurements with high temporal and spatial resolution without any artificial illumination of the sky which would disturb nearby optical experiments. However...
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Dr Tim Lukas Holch (Deutsches Elektronen-Synchrotron DESY)13/07/2022, 10:30
Aerosol levels influence the wavelength dependent transmission properties of the atmosphere. Variations in aerosol levels therefore affect the amount of Cherenkov light from air showers that can reach an atmospheric Cherenkov detector. As the amount of detected Cherenkov light is directly related to a primary shower particle's energy, deviations between actual and assumed atmospheric...
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Shefali Negi13/07/2022, 11:30
When using wide-field stellar photometry to measure Vertical Aerosol Optical Depth (VAOD), we model the dependence of measured stellar fluxes on the star color and position within the field of view of the imaging system in order to control systematic uncertainties introduced through those dependencies. In wide-field imagers, the Point Spread Function (PSF) varies significantly across the...
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Tareq AbuZayyad13/07/2022, 12:00
The Telescope Array (TA) experiment measures the properties of ultra-high energy cosmic ray (UHECR) induced extensive air showers. TA employs a hybrid detector comprised of a large surface array of scintillator detectors overlooked by three fluorescence telescopes stations. TA has been collecting data since ~2008. The TA Low Energy extension (TALE) detector, comprised of 10 fluorescence...
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Bianca Keilhauer (Karlsruhe Institute of Technology KIT), Laura Valore (Istituto Nazionale di Fisica Nucleare)13/07/2022, 12:30
The Pierre Auger Observatory is detecting ultra-high energy cosmic rays (UHECR) since the early 2000s years in the Pampa Amarilla, Argentina. It is composed of different detection techniques which requires the monitoring of several aspects of atmospheric conditions along with the UHECR detection. We are presenting the multitude of atmospheric monitoring devices and their application in air...
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Roberto Mussa (Istituto Nazionale di Fisica Nucleare)13/07/2022, 14:30
ELVES are regularly being studied since 2013 with the twenty-four FD Telescopes of the Pierre Auger Observatory, exploiting a dedicated trigger and extended readout.
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A large fraction of the observed events shows double ELVES within the time window, and, in some cases, even more complex structures are observed. We classify double ELVES using radial variation of the time gap and the photon flux... -
Dr Gabriela Nicora13/07/2022, 15:00
Due to its orography and southern extension, there is a great spatial variability of thunderstorms in Argentina that corresponds to mechanisms of different space-temporal scales. The central area of the country where the Pierre Auger Observatory is located (Mendoza Province, Argentina) presents unique meteorological and geographical conditions that result in a high spatial density of...
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Max Büsken (Karlsruher Institut für Technologie)13/07/2022, 15:30
The Pierre Auger Observatory is the largest ground-based experiment for the detection of ultra-high energy cosmic rays. In a hybrid approach, many detectors - including radio antennas - observe the extensive air showers induced by cosmic rays. As part of the AugerPrime upgrade, new antennas will be installed on each of the surface detector stations covering a total area of around 3000 km²....
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Ashot Chilingarian13/07/2022, 16:00
We introduce a novel method for remote sensing of atmospheric electric fields. Advanced particle spectrometers operated on the mountain altitudes on Aragats station are tuned for the measurement of energy spectra of charged and neutral particles separately. This gives the possibility to estimate the strength of the electric field in the lower atmosphere and estimate the particle flux incident...
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Martin Schimassek14/07/2022, 09:30
The Pierre Auger Observatory is designed to measure the highest energy
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cosmic-rays.
However, the surface detector, covering 3\,000\,km$^2$, is also sensitive to
events associated with atmospheric electricity.
These events can be distinguished from normal cosmic-ray events in both
temporal and spatial structure.
With signals lasting around 10 $\mu$s, they are about an order of
magnitude... -
Prof. John Belz14/07/2022, 10:00
We present an overview and most recent observations of the lightning research program being conducted in conjunction with the Telescope Array cosmic ray observatory in Utah, U.S.A. This program focuses on understanding the initial breakdown stage of lightning through observations of downward Terrestrial Gamma-ray Flashes (TGFs).
Recent observations have demonstrated that Terrestrial...
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Prof. Rasha Abbasi (Loyola University Chicago )14/07/2022, 10:30
In this talk I will present observations of lightning and terrestrial gamma ray initiation at the Telescope Array (TA) detector. The Telescope Array detector is located in the southwestern desert of the State of Utah. The combination of size and elevation makes it a unique tool that allows us to study thunderstorms. Currently it is the largest ultra high energy cosmic ray experiment in the...
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Brian Hare (University of Groningen)14/07/2022, 11:30
Multiple recent works by the LOFAR lightning team have established the existence of a type of negative leader that emits extremely intense radio radiation. In addition, these leaders propagate about ten times faster than normal negative leaders (10^6 m/s vs 10^5 m/s). We refer to this phenomena as Intensely Radiating Negative Leaders or IRNLs; it is plausible they could be related to...
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Adriano Di Giovanni (Gran Sasso Science Institute)14/07/2022, 12:00
Serendipitously discovered by the BATSE mission in the nineties, Terrestrial Gamma-ray Flashes (TGFs) represent the most intense and energetic natural emission of gamma rays from our planet. TGFs consist of sub-millisecond bursts of gamma rays (energy up to one hundred MeV) generated during powerful thunderstorms by lightenings and are in general companions of several other counterparts...
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Ashot Chilingarian14/07/2022, 12:30
Different kinds of particle accelerators are operating in the intergalactic plasmas filling the space with high-energy hadrons and gamma rays, which reach the earth’s atmosphere and unleash extensive air showers (EASs) consisting of millions and billions of elementary particles covering several km2 on the ground. During thunderstorms, emerging strong electric fields modulate the EAS particles...
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Markus Gaug (Universitat Autònoma de Barcelona and Centre d’Estudis i Recerca Espacial, CERES (IEEC-UAB), 08193 Bellaterra, Spain)14/07/2022, 14:30
We present a full analysis of the seven years of quasi-continuous LIDAR data
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taken during those nights when the MAGIC telescopes were operating. Characterization of the nocturnal ground layer yields zenith and azimuth angle dependent aerosol
extinction scale heights for clear nights. We derive aerosol transmission statistics for light emitted from various altitudes throughout the year and... -
Felix Schmuckermaier (Max-Planck-Institute for Physics)14/07/2022, 15:00
The Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes are a system of two Imaging Atmospheric Cherenkov Telescopes (IACTs). IACTs make calorimetric use of the Earth’s atmosphere, which allows them to reach large effective areas, but also makes them strongly dependent on the quality of the atmosphere at the time of the observations. Dust intrusions or clouds obscuring the...
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18. Elastic LIDAR Monitoring of the Night-sky Brightness over the Observatory Roque de los MuchachosLovro Pavletić (University of Rijeka, Faculty of Physics, 51000 Rijeka, Croatia)14/07/2022, 15:30
Every large world-class observatory must operate in a very dark environment that is as free as possible of anthropogenic sources of light pollution, which can degrade the quality of ground-based astronomical observations. Any LIDAR is able to measure, and subtract from its laser return signals, a corresponding contribution from the night-sky brightness. Our elastic LIDAR system is operated in...
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Marco Iarlori (Istituto Nazionale di Fisica Nucleare)14/07/2022, 16:30
The ARCADE Raman Lidar (RL) has been installed at ORM in October 2018 for the pre-production phase of Cherenkov Telescope Array (CTA). The RL has collected vertical profiles of aerosol optical properties and water vapour two times a day, at sunrise and sunset, in automatic and unattended mode. Although the on-site services have been less than scheduled, mainly because the COVID-19 outbreak,...
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Roberto Mussa (Istituto Nazionale di Fisica Nucleare)14/07/2022, 17:00
Cloud features above the Pierre Auger Observatory (Mendoza Province, Argentina) produce significant effects on the reconstruction of Extensive Air Showers.
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In this work, we present seasonal variations of cloud-base height, cloud coverage, and correlation between different sites using the information of elastic multiangle lidar data.
This system locates the presence of clouds by measuring... -
Prof. Vincenzo Rizi (CETEMPS/DSFC and INFN, Università Degli Studi dell'Aquila, L'Aquila, Italy.)14/07/2022, 17:30
The Raman lidar (RL) at the Central (Raman) Laser Facility (CRLF) of the Pierre Auger Observatory in Argentina, has been operational since September 2013.
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In this talk, the Auger RL performances are discussed in terms of the data quality for the assessment of the aerosol contribution to the atmospheric UV optical transparency, and how much this is important for the reconstruction of the UHECR... -
Miha Živec (University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia)15/07/2022, 09:00
The Cherenkov Telescope Array (CTA), currently under construction, is the next-generation very-high-energy gamma-ray observatory, providing the coverage for photons in enegy range 20 GeV to 300 TeV. CTA will increase detection sensitivity in the 100 GeV to 10 TeV range for a factor of 5 − 10 with respect to present experiments. It retrieves the properties of very-high-energy gamma-rays by...
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Mr Felix Knapp (Karlsruher Institut für Technologie)15/07/2022, 09:30
The Pierre Auger Observatory is a large-scale experiment for the investigation of ultra-high-energy cosmic rays. A combination of Surface Detector and Fluorescence Detector is used to measure the extensive air showers that are initiated by cosmic ray particles.
Aeolus is a satellite that is operated by the ESA with the purpose of making wind profile measurements on a global scale. To this...
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Takeshi Okuda (Ritsumeikan Univerisity)15/07/2022, 10:00
The Telescope Array (TA) experiment detects airshowers induced by ultra high energy cosmic rays. The atmospheric Fluorescence telescopic Detector(FD) observes cosmic ray airshower, which is incident very far from the telescope. The observation does not take place in overcast night. However, the cloud status changes quickly and sometimes there are some isolated clouds. For airshower...
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Carla Taricco (Dipartimento di Fisica-Torino)15/07/2022, 11:00
Cosmic radiation is a potential additional tool for atmospheric monitoring. High-energy cosmic rays, interacting in atmosphere, produce secondary particles, the production and propagation of which is ruled by the state of the atmosphere. In particular, atmospheric muons carry information on the stratosphere, as its temperature modulates their intensity.
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We present a comprehensive... -
Vlastimil Jílek (Palacky University), Zuzana Svozilíková (Palacky University)15/07/2022, 11:30
The Fluorescence detector Array of Single-pixel Telescopes (FAST) is a design for a next-generation ground-based ultra-high energy cosmic ray observatory, addressing the requirements for a large-area, low-cost detector suitable for measuring the properties of the highest energy cosmic rays with an unprecedented aperture. Three telescope prototypes are installed nearby the fluorescence...
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Vlastimil Jílek (Palacky University)15/07/2022, 12:00
The Southern Wide-field Gamma-ray Observatory (SWGO) is a proposed gamma-ray observatory based on the ground-level particle detection technique, with close to 100% duty cycle and an order of steradian field of view. SWGO will be located in South America at a latitude between 10 and 30 degrees south and an altitude of 4.4 km or higher, covering an energy range from hundreds of GeV to PeV. The...
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