Interactions of high-energy (E>5×1019 eV) photons in the Earth's magnetic field

McBreen, B. and Lambert, Colin (1981) Interactions of high-energy (E>5×1019 eV) photons in the Earth's magnetic field. Physical Review D, 24 (9). pp. 2536-2538. ISSN 1550-7998

Abstract

Cosmic-ray photons of energy >5 × 1019 eV will pair produce in the Earth's magnetic field. The electrons radiate by quantum synchrotron radiation; the produced photons may in turn pair produce and continue the cascade. This electromagnetic cascade interacts with the Earth's atmosphere and produces an extensive air shower. Some implications for determining the photon contribution to the highest-energy cosmic rays are discussed.