High electric fields that occur in thunderstorm clouds in the Earth’s atmosphere might accelerate energetic charged particles produced by cosmic rays. Such energetic particles, especially electrons, can cause additional ionization as they are multiplied and thus form avalanche of relativistic electrons. These relativistic electrons emit Bremsstrahlung in the X- or gamma-ray spectral ranges as they lose their kinetic energy via collisions. Thunderstorm ground enhancements (TGEs) of secondary cosmic ray fluxes recorded at the top of a sharp rocky mountain of Lomnický Štít in High Tatras (2634 m, Slovak Republic) are compared with simultaneous measurements of electric field at the mountain top and on its slope at the observatory of Skalnaté Pleso (1780 m). Results of measurements performed from May to September in 2017 and from May to October in 2018 are presented. The cosmic ray flux is measured by Space Environment Viewing and Analysis Network (SEVAN) and by neutron monitor with 1-s resolution. The TGEs that persisted usually several minutes were mainly detected in the SEVAN channel 1 which has the lowest energy threshold, about 7–8 MeV. A statistical analysis shows that these enhancements usually occurred (not only) during large values of vertical, upward-pointing electric fields measured just above the detector. It is shown that the measurement of electric field at Skalnaté Pleso, distant about 1.86 km from the mountain top is also partly correlated with the enhancements and can provide additional useful information about the distance or dimension of charge structure and dynamics of electric field, especially on short time scales. The enhancements usually did not exceed several tens of percent of background values. However, events that exceeded the background values several times were also recorded. The most extreme event exceeded the background values about 215 times. This event was also detected by other SEVAN channels and by the neutron monitor (~ 130% enhancement), which indicates a possibility of photonuclear reactions. The enhancements were often terminated by a nearby lightning.

中文翻译：

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雷暴期间，高塔特拉山脉 Lomnický Štít 高山峰的二次宇宙射线和电场显着增强

地球大气中雷暴云中出现的高电场可能会加速宇宙射线产生的高能带电粒子。这种高能粒子，尤其是电子，会在它们倍增时引起额外的电离，从而形成相对论电子的雪崩。这些相对论电子在 X 射线或伽马射线光谱范围内发射轫致辐射，因为它们通过碰撞失去动能。在 High Tatras（2634 m，斯洛伐克共和国）的 Lomnický Štít 陡峭的岩石山顶部记录的次级宇宙射线通量的雷暴地面增强 (TGE) 与山顶及其斜坡上电场的同步测量值进行了比较Skalnaté Pleso (1780 m) 的天文台。介绍了 2017 年 5 月至 9 月和 2018 年 5 月至 10 月的测量结果。宇宙射线通量由空间环境观察和分析网络 (SEVAN) 和分辨率为 1 秒的中子监视器测量。通常持续几分钟的 TGE 主要在具有最低能量阈值的 SEVAN 通道 1 中检测到，约为 7-8 MeV。统计分析表明，这些增强通常（不仅）发生在探测器正上方测量的大垂直向上电场值期间。表明在 Skalnaté Pleso 的电场测量，距离约 1. 距离山顶 86 公里也部分地与增强相关，并且可以提供有关电荷结构的距离或维度和电场动力学的额外有用信息，尤其是在短时间尺度上。增强通常不超过背景值的百分之几十。但是，也记录了多次超过背景值的事件。最极端的事件超过背景值约 215 倍。该事件也被其他 SEVAN 通道和中子监测器（约 130% 增强）检测到，这表明光核反应的可能性。增强通常被附近的闪电终止。还记录了多次超过背景值的事件。最极端的事件超过背景值约 215 倍。该事件也被其他 SEVAN 通道和中子监测器（约 130% 增强）检测到，这表明光核反应的可能性。增强通常被附近的闪电终止。还记录了多次超过背景值的事件。最极端的事件超过背景值约 215 倍。该事件也被其他 SEVAN 通道和中子监测器（约 130% 增强）检测到，这表明光核反应的可能性。增强通常被附近的闪电终止。