Molecular Bremsstrahlung Radiation at GHz Frequencies in Air

Abstract : A detection technique for ultra-high energy cosmic rays, complementary to the fluorescence technique, would be the use of the molecular Bremsstrahlung radiation emitted by low-energy ionization electrons left after the passage of the showers in the atmosphere. In this article, a detailed estimate of the spectral intensity of photons at ground level originating from this radiation is presented. The spectral intensity expected from the passage of the high-energy electrons of the cascade is also estimated. The absorption of the photons in the plasma of electrons/neutral molecules is shown to be negligible. The obtained spectral intensity is shown to be $2\times10^{-21} $W cm$^{-2}$ GHz$^{-1}$ at 10 km from the shower core for a vertical shower induced by a proton of $10^{17.5}$ eV. In addition, a recent measurement of Bremsstrahlung radiation in air at gigahertz frequencies from a beam of electrons produced at 95 keV by an electron gun is also discussed and reasonably reproduced by the model.
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Submitted on : Tuesday, January 5, 2016 - 8:27:25 AM
Last modification on : Thursday, March 21, 2019 - 2:24:30 PM

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I. Al Samarai, C. Berat, O. Deligny, A. Letessier-Selvon, F. Montanet, et al.. Molecular Bremsstrahlung Radiation at GHz Frequencies in Air. Physical Review D, American Physical Society, 2016, 93, pp.052004 ⟨10.1103/PhysRevD.93.052004⟩. ⟨in2p3-01250570⟩

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