Abstract
The periodicities of cosmic ray intensity variation are analyzed using Lomb-Scargle Fourier transformation method with about 37 billion cosmic ray events recorded by Tibet III Air Shower Array during the period from November 1999 to November 2005. To eliminate meteorological effect, we adopt East-West subtraction method. According to our analysis, besides the well known solar diurnal, sidereal diurnal and sidereal semi-diurnal periodic modulations at a level of 10 i3 , no other periodicity is found to have large enough significance from 1 hour to 2 years in energy range from 3.0 TeV to 12.0 TeV.
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