Projects / Programmes source: ARIS

Atmospheric remote sensing for Cherenkov Telescope Array and its impact on science from large sky survey observations

Research activity

Code Science Field Subfield
1.02.00  Natural sciences and mathematics  Physics   

Code Science Field
1.03  Natural Sciences  Physical sciences 
Cherenkov Telescope Array, atmospheric remote sensing, Raman lidar, large sky surveys, atmospheric impact
Evaluation (rules)
source: COBISS
Data for the last 5 years (citations for the last 10 years) on June 19, 2024; A3 for period 2018-2022
Data for ARIS tenders ( 04.04.2019 – Programme tender, archive )
Database Linked records Citations Pure citations Average pure citations
WoS  2,365  125,320  108,203  45.75 
Scopus  2,380  157,151  138,078  58.02 
Researchers (9)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  54552  PhD Saptashwa Bhattacharyya  Physics  Researcher  2021 - 2024 
2.  07525  PhD Andrej Filipčič  Physics  Researcher  2021 - 2024 
3.  14573  PhD Samo Stanič  Physics  Head  2021 - 2024 
4.  53557  Veronika Vodeb  Physics  Junior researcher  2021 - 2024 
5.  28308  PhD Sergey Vorobyev  Physics  Researcher  2021 - 2024 
6.  33444  PhD Gabrijela Zaharijas  Physics  Researcher  2021 - 2024 
7.  08308  PhD Danilo Zavrtanik  Physics  Researcher  2021 - 2024 
8.  11985  PhD Marko Zavrtanik  Physics  Researcher  2021 - 2024 
9.  53556  PhD Miha Živec  Physics  Junior researcher  2021 - 2024 
Organisations (2)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  1540  University of Nova Gorica  Nova Gorica  5920884000 
2.  0106  Jožef Stefan Institute  Ljubljana  5051606000 
Cosmic very high-energy (VHE, E ? 30 GeV) gamma rays carry crucial and unique information about the most energetic phenomena in the Universe. The most sensitive experimental approach in VHE gamma-ray astronomy is based on simultaneous imaging of Cherenkov flashes from the VHE gamma ray induced air showers using multiple telescopes (imaging air Cherenkov telescopes or IACTs), and reconstruction of the primary gamma-ray properties from those images. The construction of a new generation IACT facility, the Cherenkov Telescope Array Observatory (CTAO) with design sensitivity improved by at least an order of magnitude compared to existing VHE instruments and extended energy coverage, will start in 2022 in the legal form of a European Research Infrastructure Consortium (CTAO ERIC), where Slovenia will be one of the founding members. CTA is expected to enable the detection of more than 1000 new VHE gamma-ray sources over the whole sky. Since the atmosphere is used as a CTA calorimeter, atmospheric monitoring and the understanding of atmospheric processes is of paramount importance for its operation and the achievement of its science goals. The evolution of the main aerosol characteristics is extremely complex and requires the use of remote-sensing instruments, for example a Raman lidar. Laser light emitted by the lidar directly interacts with the atmospheric constituents and provides in its backscattering return the footprint of atmospheric ingredients as a function of altitude. A Raman lidar is foreseen in the CTA baseline configuration, to determine atmospheric transmission from each point along its line-of-sight to ground up to distances of 30 km, and to provide the required improvement in reducing systematic uncertainties and increasing the duty cycle for the CTA observatory, compared to the current generation of Cherenkov telescopes. Development and implementation of a Raman lidar for CTA is the primary aim of the proposed project, which directly contributes to the official “CTA Pathfinder” for the CTA North observatory at La Palma, Spain. The lidar prototype is being developed by an international team consisting researchers from Institut de Física d’Altes Energies, Spain, Universitat Autonoma de Barcelona, Spain, University of Nova Gorica, Slovenia and INFN sezione di Padova and Universita` degli studi di Padova, Italy. Our lidar device is regarded as the prime candidate for the future in-kind-contribution of a “Raman lidar” as foreseen in the CTAO technical documentation. The Barcelona Raman lidar system is therefore a crucial part of the CTA architecture. In addition to lidar development and its integration into the CTA Observatory the second aim of the project is to study the atmosphere-induced systematic uncertainties, which are expected to be particularly important for the all sky surveys with the CTA. These surveys, providing an unbiased view of the Universe at energies above tens of GeV, will be crucial in the search for the extragalactic ‘‘dark accelerators’’. To optimize the time needed to perform these surveys, a so-called ”divergent mode” of the CTA was proposed as an alternative observation strategy to the traditional parallel pointing in order to increase its instantaneous field of view. The project will focus on performance and systematic uncertainty estimation for possible CTA divergent mode setups. Both project goals address necessary steps for the construction and early-operation of the CTA and represent a critical part of Slovenian contribution to CTAO.
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