摘要
分析了2005年1月15日至27日的YBJ-ARGO-SPT实验数据,观测到了期间由太阳耀斑引起的宇宙线福布什下降,与其他观测手段的观测结果一致．根据次级粒子多重数的不同,分能区进行了讨论,发现在同一观测地点,福布什下降幅度随能量升高而变小．这是第一次在同一观测地点分能区对太阳活动期间宇宙线福布什下降的观测结果,与理论预期相符合．
The YBJ-ARGO experiment is located in Tibet at 4300m a.s.h. The data of this experiment under scalar mode can be used to study the solar modulation of cosmic ray flux at E 〉10GeV. The data during January 15-17, 2005 are analyzed, and a cosmic ray flux Forbush decrease after several X class solar flares has been observed. All detailed structures of the flux curves are similar to the results from neutron monitors. The maximum amplitudes of FD are about -6%, -6%, -4% and -3% with multiplicity greater than 1, 2, 3 and 4, respectively, i.e. the maximum amplitude of FD decreases as the energy of cosmic ray increases. These are the results about a FD measured at the same site （Yangbajing） with different cosmic ray energies for the first time.
出处
《高能物理与核物理》
CSCD
北大核心
2007年第1期34-37,共4页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金(10120130794)资助
关键词
单粒子技术
宇宙线
福布什下降
single particle technique, cosmic rays, Forbush decrease
