Distribution of EAS arrival times according to data of the EAS-1000   prototype array
  We have analysed arrival times of extensive air showers (EAS) registered with the EAS-1000 prototype array during the period from August, 1997 till February, 1999. Our analysis has revealed that though the vast majority of samples of consecutive time intervals between EAS arrival times obey the exponential distribution, there are sequences of showers that have another distribution and thus violate the homogeneity hypothesis. The search for correlation between such events and clusters of showers and events with big delays between arrival times was also carried out. 
Yu. A. Fomin, N. N. Kalmykov, G. V. Kulikov, V. I. Solovieva, V. P.   Sulakov, O. V. Vedeneev, M. Yu. Zotov