Study On The Large Scale Anisotropy Of Cosmic Rays With ARGO-YBJ Experiment

Yangbajing cosmic ray observatory is located in China's Tibet,Lhasa,the Yangbajing town 4300m above sea leve.Its use of extensive air shower(EAS) particle detection technology can be very high cosmic ray research.There are two large Cosmic ray detect equipment:Sino-Italian cooperation ARGO experiment and Sino-Japanese cooperation ASγexperiment.By virtue of its high elevation,low-threshold energy,wide-field,all-weather features,a large number of observational data is obtained.For our extensive and unique study of cosmic ray physics have laid a solid foundation.The main purpose of this thesis is study the anisotropy of cosmic ray with ARGO Experiment.Due to the magnetic field modulation of the Milky Way,cosmic ray anisotropy is only in the one-thousandth of the magnitude.For such a weak anisotropy of the study requires a large amount of statistical data and analysis precise.ARGO Experiment have run 2 years,and a large data sample was obtained,and used for this thesis work.A new analysis method is developed here based on the equi-zenith angle method,which allow us to perform a two-dimension and high precision anisotropy measurement.In the sidereal time frame,we observed the known anisotrpies of "Tail-in"and"Los s-cone",it is anastomose with the result of the ASγExperiment.But maybe the data s ample is not large enough,we does not find the compact component around the Cygn us region direction.We also studied the anisotropy of the energy dependence and fou nd that with the energy improve,The"Tail-in" and "Loss-cone" effect slowly fading.The thesis is mainly composed of following several parts:The first chapter mainly introduced the cosmic rays elementary knowledge and the cosmic rays aeolotropic knowledge;The second chapter introduced ultrarays survey method and Yangbajain ultrarays observation station,mainly introduced the Sino-Italian cooperation ARGO experiment;The third chapter exhaustive introduction was based on the zenith angle method fitting method principles and analysis mentality,and simulated with MC to carrying on the examination.In the data analysis,has analyzed the zenith angle dependence azimuth distribution nonuniformity and revises after the zenith angle dependence's azimuth the appearance one kind of small angle nonuniformity.Revises after the process the data which has carried on the entire celestial region scanning,has given the great criterion aeolotropic distribution,and has studied its dependence to the energy;The fourth chapter has carried on the summary to this article,This chapter has forecast the pleasing ARGO experiment array,and carried on the opportunity which conduct the ultrarays research for us.