【摘要】 西藏羊八井位于东经90．53°,北纬30．11°,海拔4310m,垂直地磁截止刚度14．1GV．2005年1月20日羊八井太阳中子望远镜和中子监测器探测到与X7．1／2b太阳耀斑相关的GLE事件,其中太阳中子望远镜能量>40MeV的能道在5min(07:00-07:05UT)和20min(07:00-07:20UT)的时间间隔内计数率增长的统计显著性分别是3．7σ和6．0σ,同时羊八井中子监测器也探测到计数率的增长,初始时间为06:51-06:52UT．观测表明在这次GLE事件中太阳质子可被加速到能量大于10GeV．更多还原

【Abstract】 A solar cosmic rays Ground Level Enhancement(GLE) event associated with a X7.1/2b solar flare in 2005 January 20 was observed by the Yangbajing solar neutron telescope(SNT) and neutron monitor(NM), located at Yangbajing Tibet(90.53°E, 30.11°N, 4310m a.s.l) with the highest vertical geomagnetic cut-off rigidity of 14.1GV in NM network. The statistical significance of the counting rate enhancement recorded by solar neutron telescope in >40MeV channel was 3.7σin the time window of 07:00-07:05UT and 6.0a in the time window of 07:00-07:20UT, respectively. The onset time of 06:51-06:52UT for this GLE event was clearly observed by the Yangbajing NM. Our observation indicates that solar protons have been accelerated up to energies of > 10GeV during this solar event.更多还原