Flux Variations of Cosmic Ray Air Showers Detected by LHAASO-KM2A During a Thunderstorm on 10 June 2021
Creators: name: LHAASO Collaboration
name: Aharonian, F.
name: An, Q.
name: Axikegu
name: Bai, L. X.
name: Bai, Y. X.
name: Bao, Y. W.
name: Bastieri, D.
name: Bi, X. J.
name: Bi, Y. J.
name: Cai, J. T.
name: Cao, Zhe
name: Cao, Zhen
name: Chang, J.
name: Chang, J. F.
name: Chen, E. S.
name: Chen, Liang
name: Chen, Liang
name: Chen, Long
name: Chen, M. J.
name: Chen, M. L.
name: Chen, S. H.
name: Chen, S. Z.
name: Chen, T. L.
name: Chen, X. J.
name: Chen, Y.
name: Cheng, H. L.
name: Cheng, N.
name: Cheng, Y. D.
name: Cui, S. W.
name: Cui, X. H.
name: Cui, Y. D.
name: Dai, B. Z.
name: Dai, H. L.
name: Dai, Z. G.
name: Danzengluobu
name: della Volpe, D.
name: Duan, K. K.
name: Fan, J. H.
name: Fan, Y. Z.
name: Fan, Z. X.
name: Fang, J.
name: Fang, K.
name: Feng, C. F.
name: Feng, L.
name: Feng, S. H.
name: Feng, X. T.
name: Feng, Y. L.
name: Gao, B.
name: Gao, C. D.
name: Gao, L. Q.
name: Gao, Q.
name: Gao, W.
name: Gao, W. K.
name: Ge, M. M.
name: Geng, L. S.
name: Gong, G. H.
name: Gou, Q. B.
name: Gu, M. H.
name: Gu, F. L.
name: Guo, J. G.
name: Guo, X. L.
name: Guo, Y. Q.
name: Guo, Y. Y.
name: Han, Y. A.
name: He, H. H.
name: He, H. N.
name: He, S. L.
name: He, X. B.
name: He, Y.
name: Heller, M.
name: Hor, Y. K.
name: Hou, C.
name: Hou, X.
name: Hu, H. B.
name: Hu, Q.
name: Hu, S.
name: Hu, S. C.
name: Hu, X. J.
name: Huang, D. H.
name: Huang, W. H.
name: Huang, X. T.
name: Huang, X. Y.
name: Huang, Y.
name: Huang, Z. C.
name: Ji, X. L.
name: Jia, H. Y.
name: Jia, K.
name: Jiang, K.
name: Jiang, Z. J.
name: Jin, M.
name: Kang, M. M.
name: Ke, T.
name: Kuleshov, D.
name: Li, B. B.
name: Li, Cheng
name: Li, Cong
name: Li, F.
name: Li, H. B.
name: Li, H. C.
name: Li, H. Y.
name: Li, J.
name: Li, Jian
name: Li, Jie
name: Li, K.
name: Li, W. L.
name: Li, X. R.
name: Li, Xin
name: Li, Xin
name: Li, Y. Z.
name: Li, Zhe
name: Li, Zhuo
name: Liang, E. W.
name: Liang, Y. F.
name: Lin, S. J.
name: Liu, B.
name: Liu, C.
name: Liu, D.
name: Liu, H.
name: Liu, H. D.
name: Liu, J.
name: Liu, J. L.
name: Liu, J. S.
name: Liu, J. Y.
name: Liu, M. Y.
name: Liu, R. Y.
name: Liu, S. M.
name: Liu, W.
name: Liu, Y.
name: Liu, Y. N.
name: Long, W. J.
name: Lu, R.
name: Luo, Q.
name: Lv, H. K.
name: Ma, B. Q.
name: Ma, L. L.
name: Ma, X. H.
name: Mao, J. R.
name: Masood, A.
name: Min, Z.
name: Mitthumsiri, W.
name: Nan, Y. C.
name: Ou, Z. W.
name: Pang, B. Y.
name: Pattarakijwanich, P.
name: Pei, Z. Y.
name: Qi, M. Y.
name: Qi, Y. Q.
name: Qiao, B. Q.
name: Qin, J. J.
name: Ruffolo, D.
name: Sáiz, A.
name: Shao, C. Y.
name: Shao, L.
name: Shchegolev, O.
name: Sheng, X. D.
name: Shi, J. Y.
name: Song, H. C.
name: Stenkin, Yu. V.
name: Stepanov, V.
name: Su, Y.
name: Sun, Q. N.
name: Sun, X. N.
name: Sun, Z. B.
name: Tam, P. H. T.
name: Tang, Z. B.
name: Tian, W. W.
name: Wang, B. D.
name: Wang, C.
name: Wang, H.
name: Wang, H. G.
name: Wang, J. C.
name: Wang, J. S.
name: Wang, L. P.
name: Wang, L. Y.
name: Wang, R.
name: Wang, R. N.
name: Wang, W.
name: Wang, X. G.
name: Wang, X. Y.
name: Wang, Y.
name: Wang, Y. D.
name: Wang, Y. J.
name: Wang, Y. P.
name: Wang, Z. H. Wang. Z. X.
name: Wang, Zhen
name: Wang, Zheng
name: Wei, D. M.
name: Wei, J. J.
name: Wei, Y. J.
name: Wen, T.
name: Wu, C. Y.
name: Wu, H. R.
name: Wu, S.
name: Wu, X. F.
name: W, Y. S.
name: Xi, S. Q.
name: Xia, J.
name: Xia, J. J.
name: Xiang, G. M.
name: Xiao, D. X.
name: Xiao, G.
name: Xin, G. G.
name: Xin, Y. L.
name: Xing, Y.
name: Xiong, Z.
name: Xu, D. L.
name: Xu, R. X.
name: Xue, L.
name: Yan, D. H.
name: Yan, J. Z.
name: Yang, C. W.
name: Yang, F. F.
name: Yang, H. W.
name: Yang, J. Y.
name: Yang, L. L.
name: Yang, M. J.
name: Yang, R. Z.
name: Yang, S. B.
name: Yao, Y. H.
name: Yao, Z. G.
name: Ye, Y. M.
name: Yin, L. Q.
name: Yin, N.
name: You, X. H.
name: You, Z. Y.
name: Yu, Y. H.
name: Yuan, Q.
name: Yue, H.
name: Zeng, H. D.
name: Zeng, T. X.
name: Zeng, W.
name: Zeng, Z. K.
name: Zha, M.
name: Zhai, X. X.
name: Zhang, B. B.
name: Zhang, F.
name: Zhang, H. M.
name: Zhang, H. Y.
name: Zhang, J. L.
name: Zhang, L. X.
name: Zhang, Li
name: Zhang, Lu
name: Zhang, P. F.
name: Zhang, P. P.
name: Zhang, R.
name: Zhang, S. B.
name: Zhang, S. R.
name: Zhang, S. S.
name: Zhang, X.
name: Zhang, X. P.
name: Zhang, Y. F.
name: Zhang, Y. L.
name: Zhang, Yi
name: Zhang, Yong
name: Zhao, B.
name: Zhao, J.
name: Zhao, L.
name: Zhao, L. Z.
name: Zhao, S. P.
name: Zheng, F.
name: Zheng, Y.
name: Zhou, B.
name: Zhou, H.
name: Zhou, J. N.
name: Zhou, P.
name: Zhou, R.
name: Zhou, X. X.
name: Zhu, C. G.
name: Zhu, F. R.
name: Zhu, H.
name: Zhu, K. J.
name: Zuo, X.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The Large High Altitude Air Shower Observatory (LHAASO) has three sub-arrays, KM2A, WCDA and WFCTA. The flux variations of cosmic ray air showers were studied by analyzing the KM2A data during the thunderstorm on 10 June 2021. The number of shower events that meet the trigger conditions increases significantly in atmospheric electric fields, with maximum fractional increase of 20%. The variations of trigger rates (increases or decreases) are found to be strongly dependent on the primary zenith angle. The flux of secondary particles increases significantly, following a similar trend with that of the shower events. To better understand the observed behavior, Monte Carlo simulations are performed with CORSIKA and G4KM2A (a code based on GEANT4). We find that the experimental data (in saturated negative fields) are in good agreement with simulations, assuming the presence of a uniform upward electric field of 700 V/cm with a thickness of 1500 m in the atmosphere above the observation level. Due to the acceleration/deceleration and deflection by the atmospheric electric field, the number of secondary particles with energy above the detector threshold is modified, resulting in the changes in shower detection rate.
description: 18 pages, 11 figures