Dependence of cosmic ray intensity on variation of solar wind velocity measured by the GRAPES-3 experiment for space weather studies
Dependence of cosmic ray intensity on variation of solar wind velocity measured by the GRAPES-3 experiment for space weather studies
复制标题
用于空间天气研究的 GRAPES-3 实验测量的宇宙射线强度对太阳风速度变化的依赖性
DOI：
10.1103/physrevd.91.121303
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S.Shibata et al.
中科院分区：
文献类型：
--
作者：
H.Kojima;S.Shibata et al.
空间天气影响银河宇宙线（CR）在日光层中的传播，这可以通过扩散-对流机制来解释，该机制预测CR强度的变化应该与太阳风速度的变化密切相关（）。几种不相关的太阳现象，包括27 d太阳自转、周年、11年太阳活动、22年太阳磁循环等周期现象，和瞬态的，如福布什减少（FD），地面增强通常由太阳耀斑或日冕物质抛射引起的也影响CR强度在地球上。这些太阳现象使得定量研究太阳辐射强度对太阳辐射的依赖性变得相当困难.利用GRAPES-3 μ子望远镜2000-2005年6年的高统计μ子观测资料，研究了γ射线与CR强度的相关性。在尽量减少上述各种无关的太阳现象的影响后，使用了这六年中收集的数据。我们观察到的变化与CR强度之间有很强的相关性，其显著性为。
The space weather impacts propagation of galactic cosmic rays (CRs) in the heliosphere as explained by the diffusion-convection mechanism which predicts that the variation in CR intensity should be anticorrelated with changes in solar wind velocity (). Several unrelated solar phenomena, including periodic ones such as 27 d solar rotation, annual, 11 yr solar activity, 22 yr solar magnetic cycle etc., and transient ones, for example, Forbush decreases (FDs), and ground level enhancements generally caused by solar flares or coronal mass ejections also affect CR intensity on Earth. These solar phenomena make a quantitative study of dependence of CR intensity onrather difficult. Here, the high statistics muon data of six years (2000–2005) from the large GRAPES-3 muon telescope have been used to study the correlation betweenand CR intensity. Data gathered during these six years were used after minimizing the contribution of various unrelated solar phenomena outlined above. We observed a strong anticorrelation between the variations inand CR intensity at a significance of.