Japan-Australia Cooperative Observation of North-South Asymmetry in Intensity Variation of High Energy cosmic Rays (-10^<12> eV)

为了研究高能宇宙线强度变化的南北不对称性，特别是恒星各向异性，我们在1991-1992年期间与新宿大学、名古屋大学和塔斯马尼亚大学合作。自1991年12月以来，我们已经在两个站开始了两个半球观测；一个在北半球的松下，另一个在澳大利亚的利亚波塔。两个测站位于地理纬度和经度相似的交汇位置，地下深度几乎相同，西经220英里。在松四郎和154英里西向东。分别在利亚波塔。安装了相同的Muon望远镜；松广的面积为25m^2，Liapotah的面积为20m^2，都是多向型的。两个站的望远镜和电子系统已经通过公共电话线通过个人计算机系统与每个实验室相连，用于控制和发送数据。持续…1991年12月在Liapotah开始了更多的观测(从1984年4月开始在松广进行观测)，获得了以下初步结果：1.观测到的计数率与Liapotah的每个定向望远镜预期的计数率符合得很好。测量结果与预期的泊松波动符合得很好。在垂直望远镜的观测强度变化与在霍巴特(距离-90公里)测得的气压变化之间有很好的相关性(2968个数据点的系数为-0.4)。气压计系数为-0.03%/马力，与考虑高层大气温度影响的理论值基本一致。月平均值表现出明显的半年变化，可能与松下一样；夏季和冬季出现两个最大值。这些也可以从温度效应的角度得到很好的解释。分别对太阳时、恒星时和反恒星时的强度变化进行了谐和分析。对于垂直望远镜，在Liapotah获得了显著的恒星昼夜矢量：0.057*0.014%，3.1*1.0小时。该值可与松下比较；0.030*0.027%，2.5hr LST。这表明，正如预期的那样，恒星变化中可能会发现显著的南北不对称。检查了每个时间坐标中的月日向量。例如，众所周知，恒星矢量的逐月运动可以用太阳和反恒星矢量的年运动及其合成来很好地解释。较少

In order to study the north-south asymmetry in the intensity variation, particulary of sidereal anisotropy, of high energy cosmic rays (-10^<12>eV) we have collaboration between Shinshu University, Nagoya University and University of Tasmania for the period 1991-1992. We have started two hemisphere observations at two stations ; one at Matsushiro in the northen hemisphere and the other at Liapootah, Australia since December 1991. Two stations are located at a conjugate position at a similar geographical latituide and longitude, at almost the same depth underground of 220m.w.e. at Matsshiro and 154m.w.e. at Liapootah, respectively. The identical muon telescopes are installed ; 25m^2 in area at Matsushiro, and 20m^2 in area at Liapootah, both of which of multi-directional type. The telescopes and the electronics systems at both stations have been connected with each laboratory for controlling and data sending, by means of personal-computer systems, via pulic telephone lines.Continuous ob … More servations commenced in December 1991 at Liapootah (at Matsushiro the observation has been carried out since April 1984).The following preliminary results are obtained :1. Observed counting-rates are in good agreement with those expected for each directional telescope at Liapootah.2. The measured counts well follow the Poisson fluctuation as expected.3. Good correlations (With coefficient -0.4 for 2968 data points) have been found between the observed intensity variations for the vertical telescope and the variations of the barometric pressures measured at Hobart (-90 km in distance). The barometer coefficient is -0.03%/hp, which is in agreement with th theoretical values by taking into accounts the upper atmospheric temperature effect.4. Mothly average values show a remarkable semi-annual variation as likely to that at Matsushiro ; two maxima at summer and winter seasons. These also can be well explained in terms of the temperature effect.5. The intensity variations are harmonically analyzed in solar, sidereal and anti-sidereal time, respectively. Significant sidereal diurnal vector is obtained at Liapootah for the vertical telescope as ; 0.057*0.014%, 3.1*1.0hr SLT. The value may be compared with that at Matsushiro ; 0.030*0.027%, 2.5 hr LST. This indicates that significant north-south asymmetry may be found in sidereal variation as has been expected.6. Monthly diurnal vectors in each time coordinate has been examined. It is well established that month-to-month movement of sidereal vectors, for example, can be well explained in terms of annual movements of solar and anti-sidereal vectors and their synthesis. Less