Observation of a Beam of Ultrarelativistic Particles and the Cherenkov Resonance
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Previously we have reported the detection of a sequence of three particle arrival events at energies above 1019 eV during one day and from a small sky region by two extensive air shower (EAS) arrays. We have shown that the probability of a chance coincidence of the three events is very low and suggested the arrival of a short-lived particle beam at the Earth. Here we refine the energies of the recorded particles and discuss a possible beam formation mechanism that explains the observational results.
Keywordscosmic rays extensive air showers cosmic-ray spectrum particle beam shock wave
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We thank the referee for his detailed analysis and criticism. Our work was rejected by him several times or recommended for a revision. The presented text differs significantly from the original version. We are also grateful to the entire staff of the Yakutsk EAS array, which has provided its operability for more than 40 years.
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