We have estimated the reflected component of Cherenkov radiation, which arises in developing of an extensive air shower with primary energy of 10 20 eV over the ocean surface. It has been shown that, under conditions of the TUS experiment, a flash of the reflected Cherenkov photons at the end of the fluorescence track can be identified in showers with zenith angles up to ≈ 20• .
We present spectra and mass composition of cosmic rays incoming to the Earth in the energy range (0.5−2)·10 20 eV. As their sources we consider Seyfert galaxies located at distances 40 Mpc, following an acceleration model for such moderate-power objects. Mass composition of the particles at sources is assumed to be mixed. Generation spectra are described by a function E −γ0 , where γ 0 is an arbitrary parameter. It is shown that the assumptions adopted make it possible to describe experimental data provided by HiRes and Pierre Auger Observatory, using different values of γ 0 . a kalm@eas.sinp.msu.ru b olga.shustova@eas.sinp.msu.ru c uryson@sci.lebedev.ru arXiv:1112.5523v2 [astro-ph.HE]
We present computing results of the Cherenkov light propagation in air and water from extensive air showers developing over the ocean. Limits on zenith angles of the showers, at which the registration of flashes of reflected Cherenkov photons by the satellite-based detector TUS is possible, are analyzed with consideration for waves on the ocean surface.
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