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 & 22 others 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

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)599-602
Number of pages4
JournalAdvances in Space Research
Volume23
Issue number3
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

Tibet
Cosmic rays
cosmic ray showers
cosmic ray
diurnal variation
cosmic rays
air
Air
sidereal time
pressure effect
Harmonic analysis
harmonic analysis
Pressure effects
celestial sphere
atmospheric pressure
declination
Atmospheric pressure
pressure effects
cells

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., ... 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.

Sidereal daily variation of~10 tev cosmic-ray intensity observed by the tibet air shower array. / 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.; Nanjo, H.; Nishizawa, M.; Ohnishi, M.; Ohta, I.; Ouchi, T.; Ren, J. R.; Saito, To; Sakata, M.; Sasaki, T.; Shi, Z. Z.; Shibata, M.; Shiomi, A.; Shirai, T.; Sugimoto, H.; Taira, K.; Tan, Y. H.; Tateyama, N.; Torii, Shoji; Wang, H.; Yamamoto, Y.; Yuda, T.; Zhang, C. S.; Zhang, N. J.

In: Advances in Space Research, Vol. 23, No. 3, 1999, p. 599-602.

Research output: Contribution to journalArticle

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.
Munakata K, Hara T, Yasue S, Kato C, Hall DL, Mori S et al. Sidereal daily variation of~10 tev cosmic-ray intensity observed by the tibet air shower array. Advances in Space Research. 1999;23(3):599-602.
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. ; Nanjo, H. ; Nishizawa, M. ; Ohnishi, M. ; Ohta, I. ; Ouchi, T. ; Ren, J. R. ; Saito, To ; Sakata, M. ; Sasaki, T. ; Shi, Z. Z. ; Shibata, M. ; Shiomi, A. ; Shirai, T. ; Sugimoto, H. ; Taira, K. ; Tan, Y. H. ; Tateyama, N. ; Torii, Shoji ; Wang, H. ; Yamamoto, Y. ; Yuda, T. ; Zhang, C. S. ; Zhang, N. J. / Sidereal daily variation of~10 tev cosmic-ray intensity observed by the tibet air shower array. In: Advances in Space Research. 1999 ; Vol. 23, No. 3. pp. 599-602.
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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

VL - 23

SP - 599

EP - 602

JO - Advances in Space Research

JF - Advances in Space Research

SN - 0273-1177

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