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.

中文翻译：

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一束超相对论粒子的观测和切伦科夫共振

以前，我们已经报道了通过两个大型空气喷淋（EAS）阵列在一天之内以及从一个小的天空区域检测到的三个粒子到达事件的序列，这些事件的能量超过10 ¹⁹ eV。我们已经表明，这三个事件的偶然巧合的可能性非常低，并暗示了短寿命粒子束到达地球的机会。在这里，我们提炼了记录粒子的能量，并讨论了解释观测结果的可能的波束形成机制。