Shadowing of cosmic rays by the sun near maximum or at the declining phase of solar activity

M. Amenomori*, B. Z. Dai, L. K. Ding, Z. Y. Feng, K. Hibino, N. Hotta, Q. Huang, A. X. Huo, H. Y. Jia, F. Kajino, K. Kasahara, Labaciren, S. M. Liu, D. M. Mei, L. Meng, X. R. Meng, K. Mizutani, J. Mu, H. Nanjo, M. NishizawaM. Ohnishi, I. Ohta, T. Ouchi, J. R. Ren, To Saito, M. Sakata, Z. Z. Shi, M. Shibata, A. Shiomi, T. Shirai, H. Sugimoto, K. Taira, Y. H. Tan, N. Tateyama, Shoji Torii, H. Wang, Y. Yamamoto, G. C. Yu, P. Yuan, T. Yuda, C. S. Zhang, H. M. Zhang, Zhasang, Zhaxiciren, W. D. Zhou


研究成果: Article査読

19 被引用数 (Scopus)


The shadows of the Sun and Moon have been detected in the ID TeV cosmic-ray flux by the Tibet air shower array at an altitude of 4300 m above sea level. The observation covers the period 1990 June-1993 October, which almost coincides with a near-maximum and decreasing phase of the latest solar activity cycle. Using the data obtained in this period, we examined a yearly variation of the Sun's shadow, and found for the first time that the position of the Sun's shadow changed considerably every year with the phase of the solar activity. A different variation of the Sun's shadow was also found between the "away" and "toward" sectors of the interplanetary magnetic field. These results seem to suggest a causal relation between the shadow's movement and the changing inclination of the helio-spheric current sheet of the large-scale magnetic field. Further observation with higher statistics will provide a new clue to obtain direct information on the relation between a time variation of the large-scale structure of the solar and interplanetary magnetic fields and the phase of the solar activity cycle.

ジャーナルAstrophysical Journal
出版ステータスPublished - 1996

ASJC Scopus subject areas

  • 宇宙惑星科学


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