EAS Cherenkov at Gran Sasso: correlated observations at the surface and with deep underground events

Abstract

We present the first results of the observations of the atmospheric Cherenkov light emission from Extensive Air Showers, obtained from the EAS-TOP experiment at Campo Imperatore (at the Gran Sasso Laboratory). Data concern measurements at low energies, and the correlations with the e.m. and GeV muon detectors at the surface, and with the events observed deep underground (LVD detector).