On temporal variations of the

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Presentation transcript:

On temporal variations of the multi-TeV cosmic ray anisotropy using Tibet Air Shower Array Zhang Yi Institute of High Energy Physics (For the Tibet ASγ Collaboration) 32 ICRC. Beijing'2011

OUTLINE Tibet Air shower Array Motivation Analysis method Time evolution of the anisotropy Summary

Tibet Air shower Array Tibet AS array ARGO Hall

Tibet Air shower Array Located at an elevation of 4300 m (Yangbajing , China) Atmospheric depth 606g/cm2 Wide field of view (Dec. -15º,75º ) High duty cycle (>90%) Angular resolution (~0.90) Advantage----measurement of Cosmic ray Large scale anisotropy

Motivation Tibet array has successfully observed the Cosmic ray anisotropy.(4TeV-300TeV) Tibet array has obtained the data from 1999-2008. The solar activity is from maximum to minimum in this time range. Analysis of the time evolution of the anisotropy---the influence of the solar activity to the anisotropy.

Periodicity search in 3 energy ranges Solar diurnal anisotropy----due to terrestrial orbital motion around the Sun Tibet III Sidereal-diurnal anisotropy Problem to distinguish the two kinds of anisotropy -----------the data taken is incontinues and less than 1 year. Icecube

Simultaneously fit the anisotropy in local solar and sidereal time Zenith On-source Off-source Ion=Isid + Isol Zenith belt Equal

Monte Carlo simulation Local sidereal time Local solar time Expected: no signal Expected: Compton-Getting effect MC shows this method can simultaneously obtain anisotropy in local solar and sidereal time. (incontinuous data set, less than 1 year )

Data selection Fire four or more FT detectors The estimated shower center inside the array The zenith angle < 450 Nine phases of the Tibet III data

Sidereal time anisotropy in 9 Phases (1999-2008) Stable and insensitive to solar activities <<On Temporal Variations of the Multi-TeV Cosmic Ray Anisotropy Using the Tibet III Air Shower Array >>, M. Amenomori et al., ApJ 711, 119 (2010)

Time Evolution of the Sidereal Anisotropy Matsushiro Observation No steady increase Tibet Observation 2000-2007 Milagro observation The fundamental harmonic increase in amplitude with time. 1999-2008

Summary We developed a method, which could simultaneously analysis anisotropy in the two time frames. Time evolution of sidereal anisotropy in multi-TeV energy range are obtained from 1999 to 2008. The multi-TeV cosmic ray anisotropy are stable and insensitive to the solar activities. Further analysis will be done with more data.

Thanks for your attention ! 中日AS探测阵列中意ARGO实验大厅

Time evolution of the anisotropy in local solar time (12TeV) 14

Tibet III数据分布特性天顶角和方位角分布 Tibet III 事例的天顶角分布示意由于探测器所处位置不水平、地磁场影响以及其它未知效应共同造成 15

Periodicity search in 3 energy ranges Sidereal semi-diurnal Solar diurnal. Compton-Getting effect Sidereal-diurnal <<Observation of Periodic Variation of Cosmic Ray intensity with the Tibet III Air Shower Array>>, A.-F. Li Nuclear Physics B,, 529, 2008.