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The anisotropy of cosmic ray arrival directions around 10 eV |
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| Authors: | N. Hayashida M. Nagano D. Nishikawa H. Ohoka N. Sakaki M. Sasaki M. Takeda M. Teshima R. Torii T. Yamamoto S. Yoshida K. Honda N. Kawasumi I. Tsushima N. Inoue E. Kusano K. Shinozaki N. Souma K. Kadota F. Kakimoto K. Kamata S. Kawaguchi Y. Kawasaki H. Kitamura Y. Matsubara K. Murakami Y. Uchihori H. Yoshii |
| Affiliation: | a Institute for Cosmic Ray Research, University of Tokyo, Tokyo 188-8502, Japan b Faculty of Engineering, Yamanashi University, Kofu 400-8511, Japan c Faculty of Education, Yamanashi University, Kofu 400-8510, Japan d Department of Physics, Saitama University, Urawa 338-8570, Japan e Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan f Nishina Memorial Foundation, Komagome, Tokyo 113, Japan g Faculty of General Education, Hirosaki University, Hirosaki 036-8560, Japan h Department of Physics, Osaka City University, Osaka 558-8585, Japan i Department of Physics, Kobe University, Kobe 657-8501, Japan j Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan k Nagoya University of Foreign Studies, Nissin, Aichi 470-0197, Japan l National Institute of Radiological Sciences, Chiba 263-8555, Japan m Department of Physics, Ehime University, Matsuyama 790-8577, Japan |
| Abstract: | Anisotropy in the arrival directions of cosmic rays with energies above 1017 eV is studied using data from the Akeno 20 km2 array and the Akeno Giant Air Shower Array (AGASA), using a total of about 114 000 showers observed over 11 years. In the first harmonic analysis, we have found a strong anisotropy of 4% around 1018 eV, corresponding to a chance probability of 0.2% after taking the number of independent trials into account. with two-dimensional analysis in right ascension and declination, this anisotropy is interpreted as an excess of showers near the directions of the Galactic Center and the Cygnus region. |
| Keywords: | Cosmic ray Anisotropy Galactic magnetic field Air shower |
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