ИСТИНА

Direct and scattered Cherenkov light (CL) is one of the relevant contributions to the uncertainty of the measured flux of fluorescent light (FL) from extensive air showers (EAS). The impact of the backscattered CL was noted in response modelling of few detectors. The problem of a reliable CL and FL separation is relevant for the better high energy EAS registration and primary particle parameters estimation. This study is first step to solving for both theoretical approaches to the problem and possible design of electronics for ground, airborne and space detectors.