Abstract
During thunderstorms, the electric fields above the LHAASO array efficiently modulate Extensive air showers (EASs), initiated by an ultra-high-energy gamma ray. Because of this modulation, the possible bias of the energy estimation for primary gamma rays with energies up to 100 TeV can be up to ten-fold, and for the primary energies of 1 PeV, the bias can range from 2.5 to 3 times. This result can be essential because observation of PEVatrons by LHAASO is based on rather small statistics, and the highest energy events can occasionally coincide with thunderstorms, which are very often on the Tibet plateau.
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ACKNOWLEDGMENTS
We thank Yuri Stenkin and LHAASO collaboration for informing us that two PeV and 1 nearly PeV gamma-ray events occurred in fair weather, and no “thunderstorm multiplication” of secondary electrons took place.
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Zazyan, M., Hovsepyan, G. & Chilingarian, A. The Influence of the Strong Atmospheric Electric Fields on the Extensive Air Shower Development. Bull. Russ. Acad. Sci. Phys. 87, 1046–1048 (2023). https://doi.org/10.3103/S1062873823702386
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DOI: https://doi.org/10.3103/S1062873823702386