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Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1367..165s&link_type=abstract
INTERNATIONAL SYMPOSIUM ON THE RECENT PROGRESS OF ULTRA-HIGH ENERGY COSMIC RAY OBSERVATION. AIP Conference Proceedings, Volume
Other
Cosmic Ray Showers, Clouds, Cosmic Ray Origin, Scintillation, Extensive Air Showers, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays, Scintillation Detectors
Scientific paper
The mesurement of the extensive air shower using the fluorescence detectors (FDs) is affected by the condition of the atmosphere. In particular, FD aperture is limited by cloudiness. If cloud exists on the light path from extensive air shower to FDs, fluorescence photons will be absorbed drastically. Therefore cloudiness of FD's field of view (FOV) is one of important quality cut condition in FD analysis. In the Telescope Array (TA), an infrared (IR) camera with 320×236 pixels and a filed of view of 25.8°×19.5° has been installed at an observation site for cloud monitoring during FD observations. This IR camera measures temperature of the sky every 30 min during FD observation. IR camera is mounted on steering table, which can be changed in elevation and azimuthal direction. Clouds can be seen at a higher temperature than areas of cloudless sky from these temperature maps. In this paper, we discuss the quality of the cloud monitoring data, the analysis method, and current quality cut condition of cloudiness in FD analysis.
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