Solar diurnal anisotropy measured using muons in GRAPES-3 experiment in 2006
Solar diurnal anisotropy measured using muons in GRAPES-3 experiment in 2006
复制标题
2006年GRAPES-3实验中使用μ介子测量的太阳昼间各向异性
DOI：
10.1007/s12043-013-0561-0
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
B. Rao
中科院分区：
文献类型：
--
作者：
P. Mohanty;D. Atri;S. Dugad;S. Gupta;B. Hariharan;Y. Hayashi;A. Jain;S. Kawakami;S. D. Morris;P. K. Nayak;A. Oshima;B. Rao
Ooty的GRAPES-3实验包含一个大面积(560平方米)跟踪介子探测器。该探测器由16个模块组成，每个模块的面积为35平方米，分为四个超级模块，每个模块的面积为140平方米。µ子的阈值能量沿天顶角θ方向为秒(θ)×GeV，角分辨率为6°。通常情况下，它每天记录大约4×109个µ子。自2001年以来，Muon探测器一直在不间断地运行，从而提供了十年来宇宙射线通量随时间变化的高统计记录。然而，在使用这些数据之前，必须针对两个重要的大气效应，即大气压力和温度的变化，对Muon率进行校正。由于Ooty位于赤道附近(11.4°N)，大气温度的季节变化相对较小，在这里不考虑。由于靠近赤道，Ooty的气压变化除了其他季节变化外，还表现出占主导地位的12小时周期行为。在这里，我们讨论了一种新的精确测量压力的方法的各个方面，以及随后应用于GRAPES-3 Muon数据的校正，以校正这些由压力引起的变化。利用经压力校正的Muon数据测量了2006年太阳日各向异性的轮廓。这些数据分成四个部分，显示出2006年太阳活动相对较少的时期，太阳昼夜各向异性的幅度(~45%)和相位(~42m)都有显著变化。
The GRAPES-3 experiment at Ooty contains a large-area (560 m2) tracking muon detector. This detector consists of 16 modules, each 35 m2 in area, that are grouped into four supermodules of 140 m2 each. The threshold energy of muons is sec(θ) GeV along a direction with zenith angle θ and the angular resolution of the muon detector is 6°. Typically, it records ~4×109 muons every day. The muon detector has been operating uninterruptedly since 2001, thus providing a high statistics record of the cosmic ray flux as a function of time over one decade. However, prior to using these data, the muon rate has to be corrected for two important atmospheric effects, namely, variations in atmospheric pressure and temperature. Because of the near equatorial location of Ooty (11.4°N), the seasonal variations in the atmospheric temperature are relatively small and shall be ignored here. Due to proximity to the equator, the pressure changes at Ooty display a dominant 12 h periodic behaviour in addition to other seasonal changes. Here, we discuss various aspects of a novel method for accurate pressure measurement and subsequent corrections applied to the GRAPES-3 muon data to correct these pressure-induced variations. The pressure-corrected muon data are used to measure the profile of the solar diurnal anisotropy during 2006. The data, when divided into four segments, display significant variation both in the amplitude (~45%) and phase (~42 m) of the solar diurnal anisotropy during 2006, which was a period of relatively low solar activity.
影响因子：
5
作者：
Adamson, P.;Andreopoulos, C.;Zwaska, R.
通讯作者：
Zwaska, R.