基于小波变换的1—10TeV宇宙线周期变化研究
Detection of Superimposed Periodic Variation of 1—10 TeV Cosmic Ray Using Wavelets
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摘要: 利用小波变换， 结合折叠周期分析方法， 对羊八井宇宙线观测站Tibet AS γ阵列1998年4—6月的实验记录数据进行了周期分析， 发现 TeV和10 TeV宇宙线流强观测数据中包含0.5 和1 d周期变化， 其信噪比分别达到10和6. TeV宇宙线0.5 和1 d周期变化的最大变化幅度分别约为0.3%和0.5%， 10 TeV宇宙线约为0.4%和0.7%. We use the technique of wavelet analysis and epoch folding methods to search for the superimposed periodic signals of 1—10 TeV cosmic ray in the data obtained with Tibet Ⅱ/HD AS Array for April to June of 1998. Solar time semidiurnal and diurnal variations have been detected with about signalnoise ratio 10 and 6 for the 1 TeV and 10 TeV cosmic ray flux respectively. The semidiurnal variations are of an amplitude 0.3%, a phase 0.9 for 1 TeV cosmic ray and 0.4%, 0.9 for 10 TeV. The diurnal variations are of amplitude 0.5%, 0.7%, and phase 0.8 for 1 TeV and 10 TeV cosmic ray respectively.Abstract: We use the technique of wavelet analysis and epoch folding methods to search for the superimposed periodic signals of 1—10 TeV cosmic ray in the data obtained with Tibet Ⅱ/HD AS Array for April to June of 1998. Solar time semidiurnal and diurnal variations have been detected with about signalnoise ratio 10 and 6 for the 1 TeV and 10 TeV cosmic ray flux respectively. The semidiurnal variations are of an amplitude 0.3%, a phase 0.9 for 1 TeV cosmic ray and 0.4%, 0.9 for 10 TeV. The diurnal variations are of amplitude 0.5%, 0.7%, and phase 0.8 for 1 TeV and 10 TeV cosmic ray respectively.
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