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

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)954-958
Number of pages5
JournalAstrophysical Journal
Volume464
Issue number2 PART I
Publication statusPublished - 1996
Externally publishedYes

Fingerprint

solar activity
cosmic ray
cosmic rays
sun
magnetic field
interplanetary magnetic fields
solar cycles
Moon
solar magnetic field
Tibet
sea level
cosmic ray showers
current sheets
moon
air
inclination
sectors
statistics
magnetic fields

Keywords

  • Cosmic rays
  • Interplanetary medium
  • Magnetic fields
  • Solar wind
  • Solar-terrestrial relations

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Amenomori, M., Dai, B. Z., Ding, L. K., Feng, Z. Y., Hibino, K., Hotta, N., ... Zhou, W. D. (1996). Shadowing of cosmic rays by the sun near maximum or at the declining phase of solar activity. Astrophysical Journal, 464(2 PART I), 954-958.

Shadowing of cosmic rays by the sun near maximum or at the declining phase of solar activity. / Amenomori, M.; Dai, B. Z.; Ding, L. K.; Feng, Z. Y.; Hibino, K.; Hotta, N.; Huang, Q.; Huo, A. X.; Jia, H. Y.; Kajino, F.; Kasahara, K.; Labaciren; Liu, S. M.; Mei, D. M.; Meng, L.; Meng, X. R.; Mizutani, K.; Mu, J.; Nanjo, H.; Nishizawa, M.; Ohnishi, M.; Ohta, I.; Ouchi, T.; Ren, J. R.; Saito, To; Sakata, M.; Shi, Z. Z.; Shibata, M.; Shiomi, A.; Shirai, T.; Sugimoto, H.; Taira, K.; Tan, Y. H.; Tateyama, N.; Torii, Shoji; Wang, H.; Yamamoto, Y.; Yu, G. C.; Yuan, P.; Yuda, T.; Zhang, C. S.; Zhang, H. M.; Zhasang; Zhaxiciren; Zhou, W. D.

In: Astrophysical Journal, Vol. 464, No. 2 PART I, 1996, p. 954-958.

Research output: Contribution to journalArticle

Amenomori, M, Dai, BZ, Ding, LK, Feng, ZY, Hibino, K, Hotta, N, Huang, Q, Huo, AX, Jia, HY, Kajino, F, Kasahara, K, Labaciren, Liu, SM, Mei, DM, Meng, L, Meng, XR, Mizutani, K, Mu, J, Nanjo, H, Nishizawa, M, Ohnishi, M, Ohta, I, Ouchi, T, Ren, JR, Saito, T, Sakata, M, Shi, ZZ, Shibata, M, Shiomi, A, Shirai, T, Sugimoto, H, Taira, K, Tan, YH, Tateyama, N, Torii, S, Wang, H, Yamamoto, Y, Yu, GC, Yuan, P, Yuda, T, Zhang, CS, Zhang, HM, Zhasang, Zhaxiciren & Zhou, WD 1996, 'Shadowing of cosmic rays by the sun near maximum or at the declining phase of solar activity', Astrophysical Journal, vol. 464, no. 2 PART I, pp. 954-958.
Amenomori M, Dai BZ, Ding LK, Feng ZY, Hibino K, Hotta N et al. Shadowing of cosmic rays by the sun near maximum or at the declining phase of solar activity. Astrophysical Journal. 1996;464(2 PART I):954-958.
Amenomori, M. ; Dai, B. Z. ; Ding, L. K. ; Feng, Z. Y. ; Hibino, K. ; Hotta, N. ; Huang, Q. ; Huo, A. X. ; Jia, H. Y. ; Kajino, F. ; Kasahara, K. ; Labaciren ; Liu, S. M. ; Mei, D. M. ; Meng, L. ; Meng, X. R. ; Mizutani, K. ; Mu, J. ; Nanjo, H. ; Nishizawa, M. ; Ohnishi, M. ; Ohta, I. ; Ouchi, T. ; Ren, J. R. ; Saito, To ; Sakata, M. ; Shi, Z. Z. ; Shibata, M. ; Shiomi, A. ; Shirai, T. ; Sugimoto, H. ; Taira, K. ; Tan, Y. H. ; Tateyama, N. ; Torii, Shoji ; Wang, H. ; Yamamoto, Y. ; Yu, G. C. ; Yuan, P. ; Yuda, T. ; Zhang, C. S. ; Zhang, H. M. ; Zhasang ; Zhaxiciren ; Zhou, W. D. / Shadowing of cosmic rays by the sun near maximum or at the declining phase of solar activity. In: Astrophysical Journal. 1996 ; Vol. 464, No. 2 PART I. pp. 954-958.
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title = "Shadowing of cosmic rays by the sun near maximum or at the declining phase of solar activity",
abstract = "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.",
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author = "M. Amenomori and Dai, {B. Z.} and Ding, {L. K.} and Feng, {Z. Y.} and K. Hibino and N. Hotta and Q. Huang and Huo, {A. X.} and Jia, {H. Y.} and F. Kajino and K. Kasahara and Labaciren and Liu, {S. M.} and Mei, {D. M.} and L. Meng and Meng, {X. R.} and K. Mizutani 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 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 Yu, {G. C.} and P. Yuan and T. Yuda and Zhang, {C. S.} and Zhang, {H. M.} and Zhasang and Zhaxiciren and Zhou, {W. D.}",
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TY - JOUR

T1 - Shadowing of cosmic rays by the sun near maximum or at the declining phase of solar activity

AU - Amenomori, M.

AU - Dai, B. Z.

AU - Ding, L. K.

AU - Feng, Z. Y.

AU - Hibino, K.

AU - Hotta, N.

AU - Huang, Q.

AU - Huo, A. X.

AU - Jia, H. Y.

AU - Kajino, F.

AU - Kasahara, K.

AU - Labaciren,

AU - Liu, S. M.

AU - Mei, D. M.

AU - Meng, L.

AU - Meng, X. R.

AU - Mizutani, 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 - 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 - Yu, G. C.

AU - Yuan, P.

AU - Yuda, T.

AU - Zhang, C. S.

AU - Zhang, H. M.

AU - Zhasang,

AU - Zhaxiciren,

AU - Zhou, W. D.

PY - 1996

Y1 - 1996

N2 - 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.

AB - 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.

KW - Cosmic rays

KW - Interplanetary medium

KW - Magnetic fields

KW - Solar wind

KW - Solar-terrestrial relations

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M3 - Article

AN - SCOPUS:21344440927

VL - 464

SP - 954

EP - 958

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 PART I

ER -