Author/Authors :
Tomida، نويسنده , , Takayuki and Tsuyuguchi، نويسنده , , Yusuke and Arai، نويسنده , , Takahito and Benno، نويسنده , , Takuya and Chikawa، نويسنده , , Michiyuki and Doura، نويسنده , , Koji and Fukushima، نويسنده , , Masaki and Hiyama، نويسنده , , Kazunori and Honda، نويسنده , , Ken-ichi Ikeda، نويسنده , , Daisuke and Matthews، نويسنده , , John N. and Nakamura، نويسنده , , Toru and Oku، نويسنده , , Daisuke and Sagawa، نويسنده , , Hiroyuki and Tokuno، نويسنده , , Hisao and Tameda، نويسنده , , Yuichiro and Thomson، نويسنده , , Gordon B. and Tsunesada، نويسنده , , Yoshiki and Udo، نويسنده , , Shigeharu and Ukai، نويسنده , , Hisashi، نويسنده ,
Abstract :
An atmospheric transparency was measured using a LIDAR with a pulsed UV laser (355 nm) at the observation site of Telescope Array in Utah, USA. The measurement at night for two years in 2007–2009 revealed that the extinction coefficient by aerosol at the ground level is 0 . 033 − 0.012 + 0.016 km − 1 and the vertical aerosol optical depth at 5 km above the ground is 0 . 035 − 0.013 + 0.019 . A model of the altitudinal aerosol distribution was built based on these measurements for the analysis of atmospheric attenuation of the fluorescence light generated by ultra high energy cosmic rays.
Keywords :
Ultra high energy cosmic rays , Atmospheric transparency , fluorescence , LIDAR
