Precise measurement of the atmospheric transparency for the cosmic ray energy calibration in the TA experiment

TA实验中宇宙线能量校准大气透明度的精确测量

基本信息

批准号：
18403004
负责人：
CHIKAWA Michiyuki
金额：
$ 10.68万
依托单位：
Kinki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

1. There are many experiments to measure the atmospheric properties, especially its transparency, in the field of meteolology, planet science, earth science, environmental science, biological and so on. The purposes of their experiments are really manifold and there are many theoretical models to explain. The atmosphere is consist of molecules of some chemical components and various aerosol, and has very important role for the weather condition and the thermal balance due to circulation in the troposphere.An atmospheric monitoring system has installed at Utah desert in the USA, to study the properties of atmosphere using a laser LIDAR(Light Detection And Ranging) system and an infra-red(IR) camera. Its original aim is to measure the atmospheric transparency for a cosmic rays experiment, the Telescope Array Experiment, which has many fluorescent light detectors. For this aim, the atmospheric extinction coefficient and the cloudiness should be determined precisely as possible, e.g. spati … More al resolution of less than 15m.2. What have done are ;(1) The LIDAR system consisits of a laser emitter and a light receiver with a photo multiplier tube(PMT) mounting on a steerable base. The laser emits pulse lights successively into the atmosphere and the receiver detects scattered faint lights by the PMT. To determine the atmospheric extinction coefficient, a large amount of data has been acquired using LIDAR system at the Utah desert commencing from July 2005. There are over 310,000 events data at the end of FY2007 and is analyzed by means of so-called the slope method and/or the Klett's method after due consideration of atmospheric pressure effect. A consistent result with a calculation of the Rayleigh scattering is obtained for the vertical extinction coefficient above an altitude of about ten kilometres in a calm weather. It is also found that the one-dimentional atmospheric density model is reasonable assumption within the accuracy of few percent uncertainty on a limitative condition in the Utah desert.(2) The LIDAR for LR site is still continued an R&D and shall expect to install in FY2008.(3) We can also suggests to distinguish the Rayleigh scattering (air molecular) component and the Mie(aerosol) scattering componet from the data analysis within several percents resolution comparing with a theoretical prediction.Also we have installed an infra-red camera at BRM site in March 2008 to measure cloud and/or water vapour component in the atmosphere. Less

1。在气象学，行星科学，地球科学，环境科学，生物学等领域，有许多实验可以测量大气特性，尤其是其透明度。他们的实验的目的确实是多方面的，并且有许多理论模型可以解释。 The atmosphere is consist of molecules of some chemical components and various aerosol, and has very important role for the weather condition and the thermal balance due to circulation in the troposphere.An atmospheric monitoring system has installed at Utah desert in the USA, to study the properties of atmospheric using a laser LIDAR(Light Detection And Ranging) system and an infra-red(IR) camera.它的最初目的是测量宇宙射线实验的大气透明度，即望远镜阵列实验，该实验具有许多荧光探测器。为此，应尽可能精确确定大气延伸系数和浑浊度，例如Spati…超过15m.2。所做的是;（1）LIDAR系统由激光发射器和带有照相乘数管（PMT）安装在可进入基座上的光接收器组成。激光成功地发出了脉冲灯，并通过PMT检测到散落的灯光。为了确定大气扩展系数，使用2005年7月开始的犹他州沙漠的LiDar系统获得了大量数据。2007财年末，有310,000多个事件数据，并通过所谓的斜坡方法和/或在适当考虑大气压力效应后通过所谓的斜坡方法和/或Klett的方法进行了分析。在平静的天气中，在高度约十公里以上的垂直延伸系数中获得了雷利散射的一致结果。还发现，在犹他州沙漠中有限的条件下，不确定性的准确性很少，一定程度的大气密度模型是合理的假设。（2）LR站点的激光雷达仍在继续进行研发，并希望在2008财年中安装。（3）我们还可以建议从雷尔（Rayle）散射（空气中）（空气分子）分散（空气中的Mie）（MIEL）分散（MIY）（MIY）的群体（MIEL）分散（MIEL）（MIY）的群体（MIEL）（MIY）（Mie）（Miy）（Miy）的群体分散（MIEL）（MIEL）（MIY）（MIY）的群体（MIEL）（MIER）（Mie）（Miy）的群体（Mie）（Miy）（Miy）的群体分散（Mie）（Mie）（Miy）的分散率（Miy）。与理论预测相比。此外，我们在2008年3月在BRM站点安装了一台红外摄像头，以测量大气中的云和/或水蒸气组件。较少的