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  • Open Access

X-rays emission: A novel tool to detect extensive air showers

Rodrigo Alberto Torres Saavedra*, Caterina Trimarelli, and Roberto Aloisio

John F. Krizmanic

Johannes Eser

Austin Cummings

  • *Contact author: rodrigo.torressaavedra@gssi.it
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Phys. Rev. D 113, 123067 – Published 29 June, 2026

DOI: https://doi.org/10.1103/qnlg-4vnd

Abstract

We investigate the feasibility of detecting extensive air showers via their geo-synchrotron x-ray emission from high-altitude platforms. Starting from first principles, we derive a differential expression for the number of emitted photons per unit grammage and photon energy for an ensemble of gyrating shower electrons. The calculation uses noted parametrizations of the electron state variable distributions in the shower to establish a scale for the photon footprint and, further, takes into account the propagation of emitted photons in the atmosphere. The computed fluxes at the position of the detector are used to estimate the detector acceptance and event rate using a bootstrap Monte-Carlo procedure. For a 1 m-radius, 70° half-aperture circular detector at an altitude between 20 km to 30 km viewing the Earth’s limb, we find acceptances at the O(1  m2 sr) level and integral event rates of O(10) per month. These results indicate that x-ray geo-synchrotron emission is a promising, complimentary channel for high-altitude indirect cosmic ray detection in the PeV regime.

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Information

Phys. Rev. D 113, 123067– Published 29 June, 2026
  • Received 23 January 2026
  • Accepted 21 May 2026
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