A study of the shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array

M. Amenomori, S. Ayabe, Caidong, Danzengluobu, L. K. Ding, Z. Y. Feng, Y. Fu, H. W. Guo, M. He, K. Hibino, N. Hotta, Q. Huang, A. X. Huo, K. Izu, H. Y. Jia, F. Kajino, K. Kasahara, Y. Katayose, Labaciren, J. Y. Li & 41 others H. Lu, S. L. Lu, G. X. Luo, X. R. Meng, K. Mizutani, J. Mu, H. Nanjo, M. Nishizawa, M. Ohnishi, I. Ohta, T. Ouchi, Z. R. Peng, J. R. Ren, T. Saito, M. Sakata, T. Sasaki, Z. Z. Shi, M. Shibata, A. Shiomi, T. Shirai, Y. Suga, H. Sugimoto, K. Taira, Y. H. Tan, N. Tateyama, Shoji Torii, T. Utsugi, C. R. Wang, H. Wang, X. W. Xu, Y. Yamamoto, G. C. Yu, A. F. Yuan, T. Yuda, C. S. Zhang, H. M. Zhang, J. L. Zhang, N. J. Zhang, X. Y. Zhang, Zhaxiciren, Zhaxisangzhu

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We have shown that the Sun's shadow by high-energy cosmic rays moves year by year and its behavior is correlated with a time variation of the large-scale structure of the solar and interplanetary magnetic fields. The solar activity was near minimum in the period from 1996 through 1997. Using the data obtained with the Tibet air shower array, we examined the shadowing of cosmic rays by the Sun in this quiet phase of the solar cycle and found that the Sun's shadow was just in the apparent direction of the Sun, though it was observed at the position considerably away from the Sun to the southwest in the period between 1990 and 1993. It is known that the magnetic pole of the equivalent solar dipole was reversed during the previous active phase, and near solar minimum the dipole was aligned with the rotating axis, preserving its N-pole on the north pole side of the Sun. This causes the solar magnetic field to shift the Sun's shadow to the east. Thus, the observed results suggest that the shift of the Sun's shadow due to the solar magnetic field was pushed back by the effect of the geomagnetic field, since the geomagnetic field always makes the shadow shift to the west. We discuss the Sun's shadow observed during the period near solar minimum in 1996-1997 and compare it with the simulation results.

Original languageEnglish
Pages (from-to)1051-1058
Number of pages8
JournalAstrophysical Journal
Volume541
Issue number2 PART 1
Publication statusPublished - 2000 Oct 1
Externally publishedYes

Fingerprint

Tibet
cosmic ray showers
solar activity
cosmic ray
sun
magnetic field
geomagnetic field
air
solar magnetic field
solar cycle
geomagnetism
cosmic rays
shift
poles
dipoles
simulation
energy
magnetic poles
interplanetary magnetic fields
solar cycles

Keywords

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

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Amenomori, M., Ayabe, S., Caidong, Danzengluobu, Ding, L. K., Feng, Z. Y., ... Zhaxisangzhu (2000). A study of the shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array. Astrophysical Journal, 541(2 PART 1), 1051-1058.

A study of the shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array. / Amenomori, M.; Ayabe, S.; Caidong; Danzengluobu; Ding, L. K.; Feng, Z. Y.; Fu, Y.; Guo, H. W.; He, M.; Hibino, K.; Hotta, N.; Huang, Q.; Huo, A. X.; Izu, K.; Jia, H. Y.; Kajino, F.; Kasahara, K.; Katayose, Y.; Labaciren; Li, J. Y.; Lu, H.; Lu, S. L.; Luo, G. X.; Meng, X. R.; Mizutani, K.; Mu, J.; Nanjo, H.; Nishizawa, M.; Ohnishi, M.; Ohta, I.; Ouchi, T.; Peng, Z. R.; Ren, J. R.; Saito, T.; Sakata, M.; Sasaki, T.; Shi, Z. Z.; Shibata, M.; Shiomi, A.; Shirai, T.; Suga, Y.; Sugimoto, H.; Taira, K.; Tan, Y. H.; Tateyama, N.; Torii, Shoji; Utsugi, T.; Wang, C. R.; Wang, H.; Xu, X. W.; Yamamoto, Y.; Yu, G. C.; Yuan, A. F.; Yuda, T.; Zhang, C. S.; Zhang, H. M.; Zhang, J. L.; Zhang, N. J.; Zhang, X. Y.; Zhaxiciren; Zhaxisangzhu.

In: Astrophysical Journal, Vol. 541, No. 2 PART 1, 01.10.2000, p. 1051-1058.

Research output: Contribution to journalArticle

Amenomori, M, Ayabe, S, Caidong, Danzengluobu, Ding, LK, Feng, ZY, Fu, Y, Guo, HW, He, M, Hibino, K, Hotta, N, Huang, Q, Huo, AX, Izu, K, Jia, HY, Kajino, F, Kasahara, K, Katayose, Y, Labaciren, Li, JY, Lu, H, Lu, SL, Luo, GX, Meng, XR, Mizutani, K, Mu, J, Nanjo, H, Nishizawa, M, Ohnishi, M, Ohta, I, Ouchi, T, Peng, ZR, Ren, JR, Saito, T, Sakata, M, Sasaki, T, Shi, ZZ, Shibata, M, Shiomi, A, Shirai, T, Suga, Y, Sugimoto, H, Taira, K, Tan, YH, Tateyama, N, Torii, S, Utsugi, T, Wang, CR, Wang, H, Xu, XW, Yamamoto, Y, Yu, GC, Yuan, AF, Yuda, T, Zhang, CS, Zhang, HM, Zhang, JL, Zhang, NJ, Zhang, XY, Zhaxiciren & Zhaxisangzhu 2000, 'A study of the shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array', Astrophysical Journal, vol. 541, no. 2 PART 1, pp. 1051-1058.
Amenomori M, Ayabe S, Caidong, Danzengluobu, Ding LK, Feng ZY et al. A study of the shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array. Astrophysical Journal. 2000 Oct 1;541(2 PART 1):1051-1058.
Amenomori, M. ; Ayabe, S. ; Caidong ; Danzengluobu ; Ding, L. K. ; Feng, Z. Y. ; Fu, Y. ; Guo, H. W. ; He, M. ; Hibino, K. ; Hotta, N. ; Huang, Q. ; Huo, A. X. ; Izu, K. ; Jia, H. Y. ; Kajino, F. ; Kasahara, K. ; Katayose, Y. ; Labaciren ; Li, J. Y. ; Lu, H. ; Lu, S. L. ; Luo, G. X. ; Meng, X. R. ; Mizutani, K. ; Mu, J. ; Nanjo, H. ; Nishizawa, M. ; Ohnishi, M. ; Ohta, I. ; Ouchi, T. ; Peng, Z. R. ; Ren, J. R. ; Saito, T. ; Sakata, M. ; Sasaki, T. ; Shi, Z. Z. ; Shibata, M. ; Shiomi, A. ; Shirai, T. ; Suga, Y. ; Sugimoto, H. ; Taira, K. ; Tan, Y. H. ; Tateyama, N. ; Torii, Shoji ; Utsugi, T. ; Wang, C. R. ; Wang, H. ; Xu, X. W. ; Yamamoto, Y. ; Yu, G. C. ; Yuan, A. F. ; Yuda, T. ; Zhang, C. S. ; Zhang, H. M. ; Zhang, J. L. ; Zhang, N. J. ; Zhang, X. Y. ; Zhaxiciren ; Zhaxisangzhu. / A study of the shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array. In: Astrophysical Journal. 2000 ; Vol. 541, No. 2 PART 1. pp. 1051-1058.
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abstract = "We have shown that the Sun's shadow by high-energy cosmic rays moves year by year and its behavior is correlated with a time variation of the large-scale structure of the solar and interplanetary magnetic fields. The solar activity was near minimum in the period from 1996 through 1997. Using the data obtained with the Tibet air shower array, we examined the shadowing of cosmic rays by the Sun in this quiet phase of the solar cycle and found that the Sun's shadow was just in the apparent direction of the Sun, though it was observed at the position considerably away from the Sun to the southwest in the period between 1990 and 1993. It is known that the magnetic pole of the equivalent solar dipole was reversed during the previous active phase, and near solar minimum the dipole was aligned with the rotating axis, preserving its N-pole on the north pole side of the Sun. This causes the solar magnetic field to shift the Sun's shadow to the east. Thus, the observed results suggest that the shift of the Sun's shadow due to the solar magnetic field was pushed back by the effect of the geomagnetic field, since the geomagnetic field always makes the shadow shift to the west. We discuss the Sun's shadow observed during the period near solar minimum in 1996-1997 and compare it with the simulation results.",
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TY - JOUR

T1 - A study of the shadowing of galactic cosmic rays by the Sun in a quiet phase of solar activity with the Tibet air shower array

AU - Amenomori, M.

AU - Ayabe, S.

AU - Caidong,

AU - Danzengluobu,

AU - Ding, L. K.

AU - Feng, Z. Y.

AU - Fu, Y.

AU - Guo, H. W.

AU - He, M.

AU - Hibino, K.

AU - Hotta, N.

AU - Huang, Q.

AU - Huo, A. X.

AU - Izu, K.

AU - Jia, H. Y.

AU - Kajino, F.

AU - Kasahara, K.

AU - Katayose, Y.

AU - Labaciren,

AU - Li, J. Y.

AU - Lu, H.

AU - Lu, S. L.

AU - Luo, G. X.

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 - Peng, Z. R.

AU - Ren, J. R.

AU - Saito, T.

AU - Sakata, M.

AU - Sasaki, T.

AU - Shi, Z. Z.

AU - Shibata, M.

AU - Shiomi, A.

AU - Shirai, T.

AU - Suga, Y.

AU - Sugimoto, H.

AU - Taira, K.

AU - Tan, Y. H.

AU - Tateyama, N.

AU - Torii, Shoji

AU - Utsugi, T.

AU - Wang, C. R.

AU - Wang, H.

AU - Xu, X. W.

AU - Yamamoto, Y.

AU - Yu, G. C.

AU - Yuan, A. F.

AU - Yuda, T.

AU - Zhang, C. S.

AU - Zhang, H. M.

AU - Zhang, J. L.

AU - Zhang, N. J.

AU - Zhang, X. Y.

AU - Zhaxiciren,

AU - Zhaxisangzhu,

PY - 2000/10/1

Y1 - 2000/10/1

N2 - We have shown that the Sun's shadow by high-energy cosmic rays moves year by year and its behavior is correlated with a time variation of the large-scale structure of the solar and interplanetary magnetic fields. The solar activity was near minimum in the period from 1996 through 1997. Using the data obtained with the Tibet air shower array, we examined the shadowing of cosmic rays by the Sun in this quiet phase of the solar cycle and found that the Sun's shadow was just in the apparent direction of the Sun, though it was observed at the position considerably away from the Sun to the southwest in the period between 1990 and 1993. It is known that the magnetic pole of the equivalent solar dipole was reversed during the previous active phase, and near solar minimum the dipole was aligned with the rotating axis, preserving its N-pole on the north pole side of the Sun. This causes the solar magnetic field to shift the Sun's shadow to the east. Thus, the observed results suggest that the shift of the Sun's shadow due to the solar magnetic field was pushed back by the effect of the geomagnetic field, since the geomagnetic field always makes the shadow shift to the west. We discuss the Sun's shadow observed during the period near solar minimum in 1996-1997 and compare it with the simulation results.

AB - We have shown that the Sun's shadow by high-energy cosmic rays moves year by year and its behavior is correlated with a time variation of the large-scale structure of the solar and interplanetary magnetic fields. The solar activity was near minimum in the period from 1996 through 1997. Using the data obtained with the Tibet air shower array, we examined the shadowing of cosmic rays by the Sun in this quiet phase of the solar cycle and found that the Sun's shadow was just in the apparent direction of the Sun, though it was observed at the position considerably away from the Sun to the southwest in the period between 1990 and 1993. It is known that the magnetic pole of the equivalent solar dipole was reversed during the previous active phase, and near solar minimum the dipole was aligned with the rotating axis, preserving its N-pole on the north pole side of the Sun. This causes the solar magnetic field to shift the Sun's shadow to the east. Thus, the observed results suggest that the shift of the Sun's shadow due to the solar magnetic field was pushed back by the effect of the geomagnetic field, since the geomagnetic field always makes the shadow shift to the west. We discuss the Sun's shadow observed during the period near solar minimum in 1996-1997 and compare it with the simulation results.

KW - Cosmic rays

KW - Interplanetary medium

KW - Magnetic fields

KW - Solar wind

KW - Solar-terrestrial relations

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M3 - Article

VL - 541

SP - 1051

EP - 1058

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 PART 1

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