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The paper presents results on the longitudinal development of air showers of ultra-high energies obtained from radio emission measurements at the Yakutsk array. The energy, the depth of maximum development of individual showers are determined and a statistical analysis of X max  in order to estimate the fluctuation of air shower development σ(X max ) in the energy region 10 17 -10 18  eV is performed. It is shown that σ(X max ) in the energy region 10 17 -10 18  eV is equal to 50-60 g·cm -2 , which doesn’t contradict with a mixed composition of cosmic rays - protons and helium nuclei. This is also indicated by data of the X max  value dependence on energy.

Characteristics of air showers with energy more than 1017 eV reconstructed by the Yakutsk array radio emission measurements

Characteristics of air showers with energy more than 10¹⁷ eV reconstructed by the Yakutsk array radio emission measurements