Radio emission of air showers with extremely high energy measured by the Yakutsk radio array
Abstract
The Yakutsk Array is designed to study cosmic rays at energy 1015-1020 eV. It consists several independent arrays that register charged particles, muons with energy E≥1 GeV, Cherenkov light and radio emission. The paper presents a technical description of the Yakutsk Radio Array and some preliminary results obtained from measurements of radio emission at 30-35 MHz frequency induced by air shower particles with energy ≥ 1·1017 eV. The data obtained at the Yakutsk array in 1986-1989 (first set of measurements) and 2009-2014 (new set of measurements). Based on the obtained results we determined: Lateral distribution function (LDF) of air showers radio emission with energy ≥ 1017 eV. Radio emission amplitude empirical connection with air shower energy. Determination of depth of maximum by the ratio of amplitude at different distances from the shower axis. For the first time, at the Yakutsk array, radio emission from the air shower with energy > 1019 eV was registered including the shower with the highest energy ever registered at the Yakutsk array with energy 2 · 1020 eV.
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