Abstract
The All Sky Camera (ASC) is a passive non-invasive imaging system for rapid night sky atmosphere monitoring. By design, the operation of the ASC will not affect the measurement procedure of the CTA observatory, for which we discuss its application in this report. The data collected should enable improved productivity and increased measurement time for the CTA observatory. The goal of ASC is to identify cloud position, atmosphere attenuation and time evolution of the sky condition, working within the CTA Central Calibration Facilities (CCF) group. Clouds and atmosphere monitoring may allow near-future prediction of the night-sky quality, helping scheduling. Also, in the case of partly cloudy night sky the cameras will identify the uncovered regions of the sky during the operation time, and define potential observable sources that can be measured. By doing so, a higher productivity of the CTA observatory measurements may be possible.
Highlights
The CTA (Cherenkov Telescope Array) project is an initiative to build the generation ground-based very high energy gamma-ray instrument currently under prototyping phase and soon to be built [1]
The operation of the All Sky Camera (ASC) will not affect the measurement procedure of the CTA observatory, for which we discuss its application in this report
In a possible design scenario, the southern hemisphere array of CTA will consist of three types of telescopes with different mirror sizes (SST-4m, MST-12m, LST23m) in order to cover the full energy range
Summary
The CTA (Cherenkov Telescope Array) project is an initiative to build the generation ground-based very high energy gamma-ray instrument currently under prototyping phase and soon to be built [1]. In a possible design scenario, the southern hemisphere array of CTA will consist of three types of telescopes with different mirror sizes (SST-4m, MST-12m, LST23m) in order to cover the full energy range. The CTA concept of atmospheric monitoring is divided into several tasks as climatology, off-line data selection, off-line data correction, on-line smart scheduling and weather now-cast, fore-cast, alerts and protection. To fulfill these tasks, CTA will make use of several instruments and methods like Ceilometer [2], Lidar, FRAM [3], weather stations and sensors, Cherenkov Transparency Coefficient method etc. The data from this monitoring device will provide an input for smart scheduling and short time weather forecast
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