Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..195o&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
Using arrival time series of air showers observed at Mt. Chacaltaya during 1991-1995, we have performed a time series analysis to search for non-random features of UHE cosmic rays. The location of the Chacaltaya air shower array (5200m a.s.l. and in the Southern hemisphere) is expected to reveal new asp ects of UHE cosmic rays which cannot be observed by Northern, sea-level detectors. The arrival time structure of air showers is carefully examined in method of the cluster analysis. In this analysis, we count the number of air showers (N ) observed within short time windows and compare the N distribution with the Poisson/Gaussian distribution. The discrepancy between the distributions possibly implies the existence of non-random components in UHE cosmic rays. From the Chacaltaya data, we picked up one cluster event, consisting of 182 EAS within 10min., though the significance was not enough. The arrival direction of the event was consistent with the Galactic plane, possibly implying the existence of sporadic UHE γ -ray emission from it.
Aguirre Carlos
Aoki Hideo
Hashimoto Katsumi
Honda Katsuya
Inoue Naoya
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