Sidereal daily variation of~10 tev cosmic-ray intensity observed by the tibet air shower array

K. Munakata; T. Hara; S. Yasue; C. Kato; D. L. Hall; S. Mori; M. Amenomori; S. Ayabe; L. K. Ding; K. Hibino; N. Hotta; K. Izu; H. Y. Jia; F. Kajino; K. Kasahara; D. M. Mei; K. Mizutani; K. Morimoto; J. Mu; H. Nanjo; M. Nishizawa; M. Ohnishi; I. Ohta; T. Ouchi; J. R. Ren; To Saito; M. Sakata; T. Sasaki; Z. Z. Shi; M. Shibata; A. Shiomi; T. Shirai; H. Sugimoto; K. Taira; Y. H. Tan; N. Tateyama; Shoji Torii; H. Wang; Y. Yamamoto; T. Yuda; C. S. Zhang; N. J. Zhang

Sidereal daily variation of~10 tev cosmic-ray intensity observed by the tibet air shower array

K. Munakata^*, T. Hara, S. Yasue, C. Kato, D. L. Hall, S. Mori, M. Amenomori, S. Ayabe, L. K. Ding, K. Hibino, N. Hotta, K. Izu, H. Y. Jia, F. Kajino, K. Kasahara, D. M. Mei, K. Mizutani, K. Morimoto, J. Mu, H. NanjoM. Nishizawa, M. Ohnishi, I. Ohta, T. Ouchi, J. R. Ren, To Saito, M. Sakata, T. Sasaki, Z. Z. Shi, M. Shibata, A. Shiomi, T. Shirai, H. Sugimoto, K. Taira, Y. H. Tan, N. Tateyama, Shoji Torii, H. Wang, Y. Yamamoto, T. Yuda, C. S. Zhang, N. J. Zhang

^*Corresponding author for this work

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

1 Citation (Scopus)

Abstract

We analyze the sidereal daily variation of galactic cosmic-ray intensity observed by the Tibet air-shower (AS) array in one year from January to December 1992. The Tibet AS array can detect the incident direction of each AS and allows us to examine the daily variations in different declination bands on the celestial sphere. The average hourly AS count is 26,372 and the total observation period is 5,651 hours. We analyze the hourly count rates of AS classified into nine cells according to the incident direction of each AS. The hourly count rates are corrected for the atmospheric pressure effect and also for the spurious variation due to the change in the AS size-distribution. We find that the resultant daily variations in sidereal, solar and anti-sidereal time are influenced by a significant variation (∼0.5%) which is common for the viewing directions. It is also found that such common variation is well eliminated in the "difference" variations between the eastern and western cells. From the harmonic analysis of the "difference" variations, it is concluded that there is no significant variation observed in one year of data.

Original language	English
Pages (from-to)	599-602
Number of pages	4
Journal	Advances in Space Research
Volume	23
Issue number	3
Publication status	Published - 1999
Externally published	Yes

ASJC Scopus subject areas

Space and Planetary Science
Astronomy and Astrophysics

Cite this

Munakata, K., Hara, T., Yasue, S., Kato, C., Hall, D. L., Mori, S., Amenomori, M., Ayabe, S., Ding, L. K., Hibino, K., Hotta, N., Izu, K., Jia, H. Y., Kajino, F., Kasahara, K., Mei, D. M., Mizutani, K., Morimoto, K., Mu, J., ... Zhang, N. J. (1999). Sidereal daily variation of~10 tev cosmic-ray intensity observed by the tibet air shower array. Advances in Space Research, 23(3), 599-602.

Munakata, K, Hara, T, Yasue, S, Kato, C, Hall, DL, Mori, S, Amenomori, M, Ayabe, S, Ding, LK, Hibino, K, Hotta, N, Izu, K, Jia, HY, Kajino, F, Kasahara, K, Mei, DM, Mizutani, K, Morimoto, K, Mu, J, Nanjo, H, Nishizawa, M, Ohnishi, M, Ohta, I, Ouchi, T, Ren, JR, Saito, T, Sakata, M, Sasaki, T, Shi, ZZ, Shibata, M, Shiomi, A, Shirai, T, Sugimoto, H, Taira, K, Tan, YH, Tateyama, N, Torii, S, Wang, H, Yamamoto, Y, Yuda, T, Zhang, CS & Zhang, NJ 1999, 'Sidereal daily variation of~10 tev cosmic-ray intensity observed by the tibet air shower array', Advances in Space Research, vol. 23, no. 3, pp. 599-602.

@article{a8f8449c5ce240d1a7a7da4759bcc6b5,

title = "Sidereal daily variation of~10 tev cosmic-ray intensity observed by the tibet air shower array",

abstract = "We analyze the sidereal daily variation of galactic cosmic-ray intensity observed by the Tibet air-shower (AS) array in one year from January to December 1992. The Tibet AS array can detect the incident direction of each AS and allows us to examine the daily variations in different declination bands on the celestial sphere. The average hourly AS count is 26,372 and the total observation period is 5,651 hours. We analyze the hourly count rates of AS classified into nine cells according to the incident direction of each AS. The hourly count rates are corrected for the atmospheric pressure effect and also for the spurious variation due to the change in the AS size-distribution. We find that the resultant daily variations in sidereal, solar and anti-sidereal time are influenced by a significant variation (∼0.5%) which is common for the viewing directions. It is also found that such common variation is well eliminated in the {"}difference{"} variations between the eastern and western cells. From the harmonic analysis of the {"}difference{"} variations, it is concluded that there is no significant variation observed in one year of data.",

author = "K. Munakata and T. Hara and S. Yasue and C. Kato and Hall, {D. L.} and S. Mori and M. Amenomori and S. Ayabe and Ding, {L. K.} and K. Hibino and N. Hotta and K. Izu and Jia, {H. Y.} and F. Kajino and K. Kasahara and Mei, {D. M.} and K. Mizutani and K. Morimoto and J. Mu and H. Nanjo and M. Nishizawa and M. Ohnishi and I. Ohta and T. Ouchi and Ren, {J. R.} and To Saito and M. Sakata and T. Sasaki and Shi, {Z. Z.} and M. Shibata and A. Shiomi and T. Shirai and H. Sugimoto and K. Taira and Tan, {Y. H.} and N. Tateyama and Shoji Torii and H. Wang and Y. Yamamoto and T. Yuda and Zhang, {C. S.} and Zhang, {N. J.}",

year = "1999",

language = "English",

volume = "23",

pages = "599--602",

journal = "Advances in Space Research",

issn = "0273-1177",

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TY - JOUR

T1 - Sidereal daily variation of~10 tev cosmic-ray intensity observed by the tibet air shower array

AU - Munakata, K.

AU - Hara, T.

AU - Yasue, S.

AU - Kato, C.

AU - Hall, D. L.

AU - Mori, S.

AU - Amenomori, M.

AU - Ayabe, S.

AU - Ding, L. K.

AU - Hibino, K.

AU - Hotta, N.

AU - Izu, K.

AU - Jia, H. Y.

AU - Kajino, F.

AU - Kasahara, K.

AU - Mei, D. M.

AU - Mizutani, K.

AU - Morimoto, K.

AU - Mu, J.

AU - Nanjo, H.

AU - Nishizawa, M.

AU - Ohnishi, M.

AU - Ohta, I.

AU - Ouchi, T.

AU - Ren, J. R.

AU - Saito, To

AU - Sakata, M.

AU - Sasaki, T.

AU - Shi, Z. Z.

AU - Shibata, M.

AU - Shiomi, A.

AU - Shirai, T.

AU - Sugimoto, H.

AU - Taira, K.

AU - Tan, Y. H.

AU - Tateyama, N.

AU - Torii, Shoji

AU - Wang, H.

AU - Yamamoto, Y.

AU - Yuda, T.

AU - Zhang, C. S.

AU - Zhang, N. J.

PY - 1999

Y1 - 1999

N2 - We analyze the sidereal daily variation of galactic cosmic-ray intensity observed by the Tibet air-shower (AS) array in one year from January to December 1992. The Tibet AS array can detect the incident direction of each AS and allows us to examine the daily variations in different declination bands on the celestial sphere. The average hourly AS count is 26,372 and the total observation period is 5,651 hours. We analyze the hourly count rates of AS classified into nine cells according to the incident direction of each AS. The hourly count rates are corrected for the atmospheric pressure effect and also for the spurious variation due to the change in the AS size-distribution. We find that the resultant daily variations in sidereal, solar and anti-sidereal time are influenced by a significant variation (∼0.5%) which is common for the viewing directions. It is also found that such common variation is well eliminated in the "difference" variations between the eastern and western cells. From the harmonic analysis of the "difference" variations, it is concluded that there is no significant variation observed in one year of data.

AB - We analyze the sidereal daily variation of galactic cosmic-ray intensity observed by the Tibet air-shower (AS) array in one year from January to December 1992. The Tibet AS array can detect the incident direction of each AS and allows us to examine the daily variations in different declination bands on the celestial sphere. The average hourly AS count is 26,372 and the total observation period is 5,651 hours. We analyze the hourly count rates of AS classified into nine cells according to the incident direction of each AS. The hourly count rates are corrected for the atmospheric pressure effect and also for the spurious variation due to the change in the AS size-distribution. We find that the resultant daily variations in sidereal, solar and anti-sidereal time are influenced by a significant variation (∼0.5%) which is common for the viewing directions. It is also found that such common variation is well eliminated in the "difference" variations between the eastern and western cells. From the harmonic analysis of the "difference" variations, it is concluded that there is no significant variation observed in one year of data.

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M3 - Article

AN - SCOPUS:0040439303

SN - 0273-1177

VL - 23

SP - 599

EP - 602

JO - Advances in Space Research

JF - Advances in Space Research

IS - 3

ER -

Sidereal daily variation of~10 tev cosmic-ray intensity observed by the tibet air shower array

Abstract

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