Inter-calibration of atmospheric Cherenkov telescopes with UAV-based airborne calibration system

Brown, A. M.; Müller, J.; Naurois, M. de; Clark, Paul

doi:10.1016/j.astropartphys.2022.102695

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…Over time, more precise and sophisticated methods and strategies for atmospheric calibration of Cherenkov telescopes have been developed. Various instruments such as LIDAR, UAVbased systems, ceilometer, pyrometer, and the All-Sky camera are used to characterize the state of the atmosphere and calibrate the telescopes [22][23][24][25][26][27]. Several methods have been developed to enable the analysis of cloud-affected data.…”

Section: Jcap06(2023)011mentioning

confidence: 99%

Performance and systematic uncertainties of CTA-North in conditions of reduced atmospheric transmission

Pecimotika¹,

Prester²,

Hrupec³

et al. 2023

J. Cosmol. Astropart. Phys.

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The Cherenkov Telescope Array (CTA) is the next-generation stereoscopic system of Imaging Atmospheric Cherenkov Telescopes (IACTs). In IACTs, the atmosphere is used as a calorimeter to measure the energy of extensive air showers induced by cosmic gamma rays, which brings along a series of constraints on the precision to which energy can be reconstructed. The presence of clouds during observations can severely affect Cherenkov light yield, contributing to the systematic uncertainty in energy scale calibration. To minimize these systematic uncertainties, a calibration of telescopes is of great importance. For this purpose, the influence of cloud transmission and altitude on CTA-N performance degradation was investigated using detailed Monte Carlo simulations for the case where no action is taken to correct for the effects of clouds. Variations of instrument response functions in the presence of clouds are presented. In the presence of clouds with low transmission (≤ 80%) the energy resolution is aggravated by 30% at energies below 1 TeV, and by 10% at higher energies. For higher transmissions, the energy resolution is worse by less than 10% in the whole energy range. The angular resolution varies up to 10% depending both on the transmission and altitude of the cloud. The sensitivity of the array is most severely reduced at lower energies, even by 60% at 40 GeV, depending on the clouds' properties. A simple semi-analytical model of sensitivity degradation has been introduced to summarize the influence of clouds on sensitivity and provide useful scaling relations.

show abstract

Section: Jcap06(2023)011mentioning

confidence: 99%

Performance and systematic uncertainties of CTA-North in conditions of reduced atmospheric transmission

Pecimotika¹,

Prester²,

Hrupec³

et al. 2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…Over time, more precise and sophisticated methods and strategies for atmospheric calibration of Cherenkov telescopes have been developed. Various instruments such as LIDAR, UAVbased systems, ceilometer, pyrometer, and All-Sky camera are used to characterize the state of the atmosphere and for the telescope calibration [22][23][24][25][26][27]. Several methods have been developed to allow the analysis of cloud-affected data.…”

Section: Introductionmentioning

confidence: 99%

Performance and systematic uncertainties of CTA-North in conditions of reduced atmospheric transmission

Pecimotika¹,

Prester²,

Hrupec³

et al. 2023

Preprint

View full text Add to dashboard Cite

The Cherenkov Telescope Array (CTA) is the next-generation stereoscopic system of Imaging Atmospheric Cherenkov Telescopes (IACTs). In IACTs, the atmosphere is used as a calorimeter to measure the energy of extensive air showers induced by cosmic gamma rays, which brings along a series of constraints on the precision to which energy can be reconstructed. The presence of clouds during observations can severely affect Cherenkov light yield, contributing to the systematic uncertainty in energy scale calibration. To minimize these systematic uncertainties, a calibration of telescopes is of great importance. For this purpose, the influence of cloud transmission and altitude on the CTA-North performance degradation using detailed Monte Carlo simulations has been investigated for the case when no actions are taken to correct the effects of clouds. Variations of instrument response functions in the presence of clouds are presented. In the presence of clouds with low transmission (≤ 80%) the energy resolution is aggravated by 30% at energies below 1 TeV, and by 10% at higher energies. For higher transmissions, the energy resolution is degraded by less than 10% in the whole energy range. The angular resolution varies up to 10% depending both on the transmission and altitude of the cloud. The sensitivity of the array is most severely reduced at lower energies, even by 60% at 40 GeV, depending on the clouds' properties. A simple semi-analytical model of sensitivity degradation has been introduced to summarize the influence of clouds on sensitivity and provide useful scaling relations.

show abstract

Inter-calibration of atmospheric Cherenkov telescopes with UAV-based airborne calibration system

Cited by 2 publications

References 16 publications

Performance and systematic uncertainties of CTA-North in conditions of reduced atmospheric transmission

Performance and systematic uncertainties of CTA-North in conditions of reduced atmospheric transmission

Performance and systematic uncertainties of CTA-North in conditions of reduced atmospheric transmission

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