Sun's shadow variation during the recent solar cycle 23 observed with the Tibet air shower array

M. Ohnishi, M. Amenomori, S. Ayabe, D. Chen, S. W. Cui, Danzengluobu, L. K. Ding, X. H. Ding, C. F. Feng, Z. Y. Feng, X. Y. Gao, Q. X. Geng, H. W. Guo, H. H. He, M. He, K. Hibino, N. Hotta, Haibing Hu, H. B. Hu, J. HuangQ. Huan, H. Y. Jia, F. Kajino, K. Kasahara, Y. Katayose, C. Kato, K. Kawata, Labaciren, G. M. Le, J. Y. Li, H. Lu, S. L. Lu, X. R. Meng, K. Mizutani, J. Mu, K. Munakata, A. Nagai, H. Nanjo, M. Nishizawa, M. Ohnishi, I. Ohta, H. Onuma, T. Ouchi, Shunsuke Ozawa, J. R. Ren, T. Saito, M. Sakata, T. Sasak, M. Shibata, A. Shiomi, T. Shirai, H. Sugimoto, M. Takita, Y. H. Tan, N. Tateyama, Shoji Torii, H. Tsuchiya, S. Udo, H. Wang, X. 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, Zhaxisangzhu, X. X. Zhou

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    The Sun's shadow generated by multi-TeV cosmic-ray particles has been continuously observed with the Tibet-III air shower array in 2000 through 2004 during the active period of the Solar Cycle 23 except for winter seasons (Nov. - Feb.) when the Sun moves along the low elevation tracks. According to many observations of the activity, especially clear in the sunspot number, the Solar Cycle 23 has a dip called Gnevyshev Gap early in 2001. In the yearly variation of the Sun's shadow, it becomes faint with increasing solar activity and becomes deep with declining activity. We observed unexpected deepening of the Sun's shadow just in the year 2001 when Gnevyshev Gap appeared.

    Original languageEnglish
    Title of host publication29th International Cosmic Ray Conference, ICRC 2005
    PublisherTata Institute of Fundamental Research
    Pages207-210
    Number of pages4
    Volume2
    Publication statusPublished - 2005
    Event29th International Cosmic Ray Conference, ICRC 2005 - Pune
    Duration: 2005 Aug 32005 Aug 10

    Other

    Other29th International Cosmic Ray Conference, ICRC 2005
    CityPune
    Period05/8/305/8/10

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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  • Cite this

    Ohnishi, M., Amenomori, M., Ayabe, S., Chen, D., Cui, S. W., Danzengluobu, Ding, L. K., Ding, X. H., Feng, C. F., Feng, Z. Y., Gao, X. Y., Geng, Q. X., Guo, H. W., He, H. H., He, M., Hibino, K., Hotta, N., Hu, H., Hu, H. B., ... Zhou, X. X. (2005). Sun's shadow variation during the recent solar cycle 23 observed with the Tibet air shower array. In 29th International Cosmic Ray Conference, ICRC 2005 (Vol. 2, pp. 207-210). Tata Institute of Fundamental Research.