A search for non-random cosmic-ray time series by a cluster analysis.

Details A search for non-random cosmic-ray time series by a cluster analysis. A search for non-random cosmic-ray time series by a cluster analysis.

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ncimc..21..299k&link_type=abstract

Nuovo Cimento C, Vol. 21C, N. 3, p. 299 - 316

Mathematics

Probability

5

Cosmic Rays

Scientific paper

Non-random time series of cosmic rays were searched for in air shower data of mean energy 1.1×1015eV, collected by the air shower array at Mitsuishi, Japan, during the period from January 1989 to October 1996. By clustering the arrival time of air showers, five occasions of rate elevation phenomena were found with an expected probability ≤0.05 (varying from 0.18×10-2 to 4.0×10-2) from a random distribution in 3651358 air showers. The arrival directions of these events are grouped in two regions on the Galactic plane within the latitude band ±25°, corresponding to a chance probability of 1.6% from a uniform distribution.

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