ИСТИНА

The preliminary results of method investigation of separation the Cerenkov (CL) and fluorescence (FL) light of EAS are shown. The results are based on measurements of the attenuation coefficients of the CL and FL at different filters. A total of six optical filters were investigated: filters from optical glass UFS-1, UFS-5, FS6 (BG3) and interference filters SL 360\50, SL 280-380, FF01-375/110. The measurements were performed using silicon photomultipliers (SiPM). To improve existing fluorescent light detectors, a segment of 7 SiPM was developed, which will be able to separate both components of the light flux from the EAS at the level of primary data processing. In addition, the results of simulating the response of a realistic detector from the EAS for estimating the efficiency of the method of separating CL and FL from model events with an energy of 100 PeV are presented.