Possibility of studying cosmic rays with energies > 1020 eV
Gusev G. A. , Dedenko L. G. , Zheleznykh I. M., Markov M. A.
It may be possible to detect extensive air showers at energies above 1020 eV on the basis of their radio emission, with the radio waves reflected and scattered from the ionosphere. Estimates show that it would be possible to move up to energies of 1022 eV in research on the spectrum of cosmic rays, with statistics on the order of one event per year in the absence of a "relict cutoff" of the spectrum of cosmic protons or in the case of oblique extensive air showers produced by neutrinos.