Yakutsk array radio emission registration results in the energy range of 3*10^16-5*10^18 eV

TL;DR

This study measures ultra-high energy air shower radio emissions at 32 MHz from 2008-2012, analyzing their dependence on geomagnetic angle, distance, and energy, and estimating the depth of maximum Xmax using experimental data and models.

Contribution

It provides new measurements of radio emissions from cosmic ray showers in the specified energy range and analyzes their dependence on various parameters, including Xmax estimation.

Findings

Radio signal amplitude depends on geomagnetic angle, distance, and energy.

Average lateral distribution functions are constructed for different energy intervals.

Xmax of cosmic ray showers is estimated using experimental data and models.

Abstract

This paper presents the set of measurements of ultra-high energy air shower radio emission at frequency 32 MHz in period of 2008-2012. The showers are selected by geomagnetic and azimuth angles and then by the energy in three intervals: 3*10^16 3*10^17 eV, 3*10^17 6*10^17 eV and 6*10^17 5*10^18 eV. In each energy interval average lateral distribution function using mathematically averaged data from antennas with different directions are plotted. In the paper, using experimental data the dependence of radio signal averaged amplitude from geomagnetic angle, the shower axis distance and the energy are determined. Depth of maximum of cosmic ray showers Xmax for the given energy range is evaluated. The evaluation is made according QGSJET model calculations and average lateral distribution function shape.