ON TEMPORAL VARIATIONS OF THE MULTI-TeV COSMIC RAY ANISOTROPY USING THE TIBET III AIR SHOWER ARRAY

Journal Article · Mon Mar 01 04:00:00 EST 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/711/1/119· OSTI ID:21394381

Amenomori, M ^[1]; Bi, X J; Ding, L K; Fan, C; Zhaoyang, Feng; Gou, Q B; He, H H ^[2]; Chen, D ^[3]; Cui, S W ^[4]; Danzengluobu,; Ding, X H; Guo, H W; Haibing, Hu ^[5]; Feng, C F; He, M ^[6]; Feng, Z Y ^[7]; Gao, X Y; Geng, Q X ^[8]; Hibino, K ^[9]; Hotta, N ^[10]

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1. Department of Physics, Hirosaki University, Hirosaki 036-8561 (Japan)
2. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
3. Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582 (Japan)
4. Department of Physics, Hebei Normal University, Shijiazhuang 050016 (China)
5. Department of Mathematics and Physics, Tibet University, Lhasa 850000 (China)
6. Department of Physics, Shandong University, Jinan 250100 (China)
7. Institute of Modern Physics, SouthWest Jiaotong University, Chengdu 610031 (China)
8. Department of Physics, Yunnan University, Kunming 650091 (China)
9. Faculty of Engineering, Kanagawa University, Yokohama 221-8686 (Japan)
10. Faculty of Education, Utsunomiya University, Utsunomiya 321-8505 (Japan)

We analyze the large-scale two-dimensional sidereal anisotropy of multi-TeV cosmic rays (CRs) by the Tibet Air Shower Array, with the data taken from 1999 November to 2008 December. To explore temporal variations of the anisotropy, the data set is divided into nine intervals, each with a time span of about one year. The sidereal anisotropy of magnitude, about 0.1%, appears fairly stable from year to year over the entire observation period of nine years. This indicates that the anisotropy of TeV Galactic CRs remains insensitive to solar activities since the observation period covers more than half of the 23rd solar cycle.

• OSTI ID: 21394381
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 711; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
COSMIC RADIATION
COSMIC SHOWERS
ENERGY RANGE
IONIZING RADIATIONS
MAGNETIC FIELDS
MAIN SEQUENCE STARS
RADIATIONS
SECONDARY COSMIC RADIATION
SHOWERS
SOLAR ACTIVITY
SOLAR CYCLE
STARS
STELLAR ACTIVITY
SUN
TEV RANGE