Correlations between low- and high-energy pulses detected by the LSD installation under Mt. Blanc from 10 February 1987 to 1 July 1987
Dadykin V. L., Zatsepin G. T., Korol'kova E. V., Korchagin P. V., Kudryavtsev V. A., Mal'gin A. S., Ryazhskaya O. G., Ryasnyi V. G., Khal'chukov F. F., Yakushev V. F., Aglietta M., Badino G., Bologna G., Vernetto S., Galeotti P., Castagnoli C., Castellina A., Saavedra O., Trinchero G. C., Fulgione W.
The data obtained at the LSD installation from 10 February to 1 July 1987 in a search for correlations among all pulses with energies above 5 MeV have been analyzed. Nine correlated pulse pairs (one high-energy pulse plus one low-energy pulse) were found between 5:42 UT and 10:43 UT on 23 February 1987. The time between the correlated pulses was less than 2 s. The frequency of corresponding random Poisson fluctuations is 1/ (10 yr).