The Anisotropy of Cosmic Ray Arrival Direction around 1018eV

Details The Anisotropy of Cosmic Ray Arrival Direction around 1018eV The Anisotropy of Cosmic Ray Arrival Direction around 1018eV

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3..256h&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

Anisotropy in the arrival directions of cosmic rays around 1018 eV is studied using data from the Akeno 20 km2 array and the Akeno Giant Air Shower Array (AGASA), using a total of about 216,000 showers observed over 15 years above 1017 eV . In the first harmonic analysis, we have found significant anisotropy of ˜ 4 % around 1018 eV, corresponding to a chance probability of ˜ 10-5 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. This is a clear evidence for the existence of the galactic cosmic ray up to the energy of 1018 eV . Primary particle which contribute this anisotropy may be proton or neutron.

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