Atmospherics at HiRes

Details Atmospherics at HiRes Atmospherics at HiRes

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..485m&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

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Scientific paper

The High Resolution Fly's Eye observatory (HiRes) uses the atmosphere as a calorimeter. Understanding the properties of this calorimeter, primarily the atmospheric transmission, is critical to the reconstruction of air showers from the light observed at the detectors. HiRes uses lasers to probe the atmosphere while the detectors are operating. Atmospheric corrections are derived from measured light profiles of the laser tracks recorded by the same detectors that record tracks from air showers. The atmospheric molecular component is described by Rayleigh scattering in which the air density is derived from radiosonde data. We review the HiRes atmospheric monitoring program with emphasis on the corrections used to measure the air shower energy spectrum with stereo observation. 2. Introduction Atmospheric monitoring at HiRes is an integral component of our data analysis [1]. It has come a long way from using a "standard" desert atmosphere (ICRC 1999, [2]) through an average measured atmosphere (ICRC 2001, [3]) as we had to do for the mono cular analysis of our early data. The HiRes detector consists of two sites (HR1 and HR2) separated by 12.6 km on the Dugway Army Proving Grounds in the Utah West Desert, USA. Each of these sites is equipp ed with a fully steerable frequency tripled YAG laser (355 nm), the laser pulses of which are recorded by the detector at the respective other site as they propagate through the atmosphere. A roving system using the same type of laser can be deployed in the field of view of both detectors sites simultaneously. As the two detectors use different electronics (flash-ADC at HR2 at versus sample-and-hold at HR1), the roving laser provides an important cross check not only for the relative and absolute photometric calibration of the two sites, but also for their respective reconstruction. As of the end of last year we have installed another YAG laser to shoot pulses vertically into the atmosphere from the line connecting the centers of the two detector sites, HR1 and HR2. On that imaginary line the laser is located about 22 km from HR1 and about 34 km from HR2. Tracks from its laser pulses

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