Is the large-scale sidereal anisotropy of the galactic cosmic-ray intensity really instable at TeV energies?

M. Amenomori; X. J. Bi; D. Chen; W. Y. Chen; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. F. Feng; Zhaoyang Feng; Z. Y. Feng; Q. B. Gou; H. W. Guo; Y. Q. Guo; H. H. He; Z. T. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; H. Y. Jia; L. Jiang; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le; A. F. Li; W. J. Li; C. Liu; J. S. Liu; H. Lu; X. R. Meng; K. Mizutani; K. Munakata; H. Nanjo; M. Nishizawa; M. Ohnishi; I. Ohta; Shunsuke Ozawa; X. L. Qian; X. B. Qu; T. Saito; T. Y. Saito; M. Sakata; T. K. Sako; J. Shao; M. Shibata; A. Shiomi; T. Shirai; H. Sugimoto; M. Takita; Y. H. Tan; N. Tateyama; Shoji Torii; H. Tsuchiya; S. Udo; H. Wang; H. R. Wu; L. Xue; Y. Yamamoto; Z. Yang; S. Yasue; A. F. Yuan; T. Yuda; L. M. Zhai; H. M. Zhang; J. L. Zhang; X. Y. Zhang; Y. Zhang; Yi Zhang; Ying Zhang; Zhaxisangzhu; X. X. Zhou

doi:10.1016/j.astropartphys.2012.06.005

Is the large-scale sidereal anisotropy of the galactic cosmic-ray intensity really instable at TeV energies?

M. Amenomori, X. J. Bi, D. Chen, W. Y. Chen, S. W. Cui, Danzengluobu, L. K. Ding, X. H. Ding, C. F. Feng, Zhaoyang Feng, Z. Y. Feng, Q. B. Gou, H. W. Guo, Y. Q. Guo, H. H. He, Z. T. He, K. Hibino, N. Hotta, Haibing Hu, H. B. HuJ. Huang, H. Y. Jia, L. Jiang, F. Kajino, K. Kasahara, Y. Katayose, C. Kato, K. Kawata, Labaciren, G. M. Le, A. F. Li, W. J. Li, C. Liu, J. S. Liu, H. Lu, X. R. Meng, K. Mizutani, K. Munakata, H. Nanjo, M. Nishizawa, M. Ohnishi, I. Ohta, Shunsuke Ozawa, X. L. Qian, X. B. Qu, T. Saito, T. Y. Saito, M. Sakata, T. K. Sako^*, J. Shao, M. Shibata, A. Shiomi, T. Shirai, H. Sugimoto, M. Takita, Y. H. Tan, N. Tateyama, Shoji Torii, H. Tsuchiya, S. Udo, H. Wang, H. R. Wu, L. Xue, Y. Yamamoto, Z. Yang, S. Yasue, A. F. Yuan, T. Yuda, L. M. Zhai, H. M. Zhang, J. L. Zhang, X. Y. Zhang, Y. Zhang, Yi Zhang, Ying Zhang, Zhaxisangzhu, X. X. Zhou

^*Corresponding author for this work

Waseda Research Institute for Science and Engineering

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

The sidereal cosmic-ray anisotropy at TeV energies has a large-scale deficit region distributed between 150 and 240 degrees in right ascension, which is called the "loss-cone". The Milagro experiment reported the detection of a steady increase in the loss-cone amplitude at 6 TeV from July 2000 to July 2007. In this paper, we examine Milagro's claim using the data collected by the Tibet air-shower experiment from November 1999 through December 2008. No time dependence was found in the loss-cone amplitude at 4.4, 6.2, and 11 TeV. If the increase in the loss-cone amplitude were, as Milagro argued, due to variations in the heliosphere in relation to solar activities, the same tendency would be seen at sub-TeV energies where the anisotropy is far more sensitive to solar activities. At 0.6 TeV, however, Matsushiro underground muon observatory reported no significant increase in the loss-cone amplitude during the corresponding period.

Original language	English
Pages (from-to)	237-241
Number of pages	5
Journal	Astroparticle Physics
Volume	36
Issue number	1
DOIs	https://doi.org/10.1016/j.astropartphys.2012.06.005
Publication status	Published - 2012 Aug

Keywords

Loss-cone
Sidereal cosmic-ray anisotropy
TeV

ASJC Scopus subject areas

Astronomy and Astrophysics

Access to Document

10.1016/j.astropartphys.2012.06.005

Cite this

Amenomori, M., Bi, X. J., Chen, D., Chen, W. Y., Cui, S. W., Danzengluobu, Ding, L. K., Ding, X. H., Feng, C. F., Feng, Z., Feng, Z. Y., Gou, Q. B., Guo, H. W., Guo, Y. Q., He, H. H., He, Z. T., Hibino, K., Hotta, N., Hu, H., ... Zhou, X. X. (2012). Is the large-scale sidereal anisotropy of the galactic cosmic-ray intensity really instable at TeV energies? Astroparticle Physics, 36(1), 237-241. https://doi.org/10.1016/j.astropartphys.2012.06.005

Amenomori, M, Bi, XJ, Chen, D, Chen, WY, Cui, SW, Danzengluobu, Ding, LK, Ding, XH, Feng, CF, Feng, Z, Feng, ZY, Gou, QB, Guo, HW, Guo, YQ, He, HH, He, ZT, Hibino, K, Hotta, N, Hu, H, Hu, HB, Huang, J, Jia, HY, Jiang, L, Kajino, F, Kasahara, K, Katayose, Y, Kato, C, Kawata, K, Labaciren, Le, GM, Li, AF, Li, WJ, Liu, C, Liu, JS, Lu, H, Meng, XR, Mizutani, K, Munakata, K, Nanjo, H, Nishizawa, M, Ohnishi, M, Ohta, I, Ozawa, S, Qian, XL, Qu, XB, Saito, T, Saito, TY, Sakata, M, Sako, TK, Shao, J, Shibata, M, Shiomi, A, Shirai, T, Sugimoto, H, Takita, M, Tan, YH, Tateyama, N, Torii, S, Tsuchiya, H, Udo, S, Wang, H, Wu, HR, Xue, L, Yamamoto, Y, Yang, Z, Yasue, S, Yuan, AF, Yuda, T, Zhai, LM, Zhang, HM, Zhang, JL, Zhang, XY, Zhang, Y, Zhang, Y, Zhang, Y, Zhaxisangzhu & Zhou, XX 2012, 'Is the large-scale sidereal anisotropy of the galactic cosmic-ray intensity really instable at TeV energies?', Astroparticle Physics, vol. 36, no. 1, pp. 237-241. https://doi.org/10.1016/j.astropartphys.2012.06.005

@article{52c6edb3378e4ec3a959bdf27b52ff6b,

title = "Is the large-scale sidereal anisotropy of the galactic cosmic-ray intensity really instable at TeV energies?",

abstract = "The sidereal cosmic-ray anisotropy at TeV energies has a large-scale deficit region distributed between 150 and 240 degrees in right ascension, which is called the {"}loss-cone{"}. The Milagro experiment reported the detection of a steady increase in the loss-cone amplitude at 6 TeV from July 2000 to July 2007. In this paper, we examine Milagro's claim using the data collected by the Tibet air-shower experiment from November 1999 through December 2008. No time dependence was found in the loss-cone amplitude at 4.4, 6.2, and 11 TeV. If the increase in the loss-cone amplitude were, as Milagro argued, due to variations in the heliosphere in relation to solar activities, the same tendency would be seen at sub-TeV energies where the anisotropy is far more sensitive to solar activities. At 0.6 TeV, however, Matsushiro underground muon observatory reported no significant increase in the loss-cone amplitude during the corresponding period.",

keywords = "Loss-cone, Sidereal cosmic-ray anisotropy, TeV",

author = "M. Amenomori and Bi, {X. J.} and D. Chen and Chen, {W. Y.} and Cui, {S. W.} and Danzengluobu and Ding, {L. K.} and Ding, {X. H.} and Feng, {C. F.} and Zhaoyang Feng and Feng, {Z. Y.} and Gou, {Q. B.} and Guo, {H. W.} and Guo, {Y. Q.} and He, {H. H.} and He, {Z. T.} and K. Hibino and N. Hotta and Haibing Hu and Hu, {H. B.} and J. Huang and Jia, {H. Y.} and L. Jiang and F. Kajino and K. Kasahara and Y. Katayose and C. Kato and K. Kawata and Labaciren and Le, {G. M.} and Li, {A. F.} and Li, {W. J.} and C. Liu and Liu, {J. S.} and H. Lu and Meng, {X. R.} and K. Mizutani and K. Munakata and H. Nanjo and M. Nishizawa and M. Ohnishi and I. Ohta and Shunsuke Ozawa and Qian, {X. L.} and Qu, {X. B.} and T. Saito and Saito, {T. Y.} and M. Sakata and Sako, {T. K.} and J. Shao and M. Shibata and A. Shiomi and T. Shirai and H. Sugimoto and M. Takita and Tan, {Y. H.} and N. Tateyama and Shoji Torii and H. Tsuchiya and S. Udo and H. Wang and Wu, {H. R.} and L. Xue and Y. Yamamoto and Z. Yang and S. Yasue and Yuan, {A. F.} and T. Yuda and Zhai, {L. M.} and Zhang, {H. M.} and Zhang, {J. L.} and Zhang, {X. Y.} and Y. Zhang and Yi Zhang and Ying Zhang and Zhaxisangzhu and Zhou, {X. X.}",

year = "2012",

month = aug,

doi = "10.1016/j.astropartphys.2012.06.005",

language = "English",

volume = "36",

pages = "237--241",

journal = "Astroparticle Physics",

issn = "0927-6505",