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Large-scale sidereal anisotropy of multi-TeV galactic cosmic rays and the heliosphere

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arxiv 0909.1026 v1 pith:DRPF2NGJ submitted 2009-09-05 astro-ph.GA astro-ph.HE

Large-scale sidereal anisotropy of multi-TeV galactic cosmic rays and the heliosphere

M. Amenomori , X. J. Bi , D. Chen , S. W. Cui , Danzengluobu , L. K. Ding , X. H. Ding , C. Fan
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C. F. Feng Zhaoyang Feng Z. Y. Feng X. Y. Gao Q. X. Geng Q. B. Gou H. W. Guo H. H. He M. He K. Hibino N. Hotta Haibing Hu H. B. Hu J. Huang Q. Huang H. Y. Jia L. Jiang F. Kajino K. Kasahara Y. Katayose C. Kato K. Kawata Labaciren G. M. Le A. F. Li H. C. Li J. Y. Li C. Liu Y.-Q. Lou H. Lu X. R. Meng K. Mizutani J. Mu K. Munakata A. Nagai H. Nanjo M. Nishizawa M. Ohnishi I. Ohta S. Ozawa T. Saito T. Y. Saito M. Sakata T. K. Sako M. Shibata A. Shiomi T. Shirai H. Sugimoto M. Takita Y. H. Tan N. Tateyama S. Torii H. Tsuchiya S. Udo B. Wang H. Wang Y. Wang Y. G. Wang H. R. Wu L. Xue Y. Yamamoto C. T. Yan X. C. Yang S. Yasue Z. H. Ye G. C. Yu A. F. Yuan T. Yuda H. M. Zhang J. L. Zhang N. J. Zhang X. Y. Zhang Y. Zhang Yi Zhang Ying Zhang Zhaxisangzhu X. X. Zhou (The Tibet AS gamma Collaboration) J. Kota
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keywords intensityexcessheliotailobservedamplitudeanisotropycosmicdirection
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We develop a model anisotropy best-fitting to the two-dimensional sky-map of multi-TeV galactic cosmic ray (GCR) intensity observed with the Tibet III air shower (AS) array. By incorporating a pair of intensity excesses in the hydrogen deflection plane (HDP) suggested by Gurnett et al., together with the uni-directional and bi-directional flows for reproducing the observed global feature, this model successfully reproduces the observed sky-map including the "skewed" feature of the excess intensity from the heliotail direction, whose physical origin has long remained unknown. These additional excesses are modeled by a pair of the northern and southern Gaussian distributions, each placed ~50 degree away from the heliotail direction. The amplitude of the southern excess is as large as ~0.2 %, more than twice the amplitude of the northern excess. This implies that the Tibet AS experiment discovered for the first time a clear evidence of the significant modulation of GCR intensity in the heliotail and the asymmetric heliosphere.

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