The time variation of the cosmicray flux is one of crucial problems in the field of cosmicrayphysics, solar geophysics and astrophysics, etc.
宇宙线强度随时间的变化，是宇宙线物理、太阳地球物理和天体物理等交叉学科中的重要问题之一。
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The sidereal diurnal variation of cosmicray ties up with the most basic and important problem in cosmicrayphysics such as the origin, propagation and the acceleration mechanisms of cosmicray.