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Description
The phenomenon of the incident angle theta of cosmic rays decreasing during thunderstorms has been observed in many cosmic ray experiments. This paper adopts a two-dimensional projection method and uses continuous comparison to demonstrate the changes in the incident direction of cosmic ray events during thunderstorms on a two-dimensional scale. It is hypothesized that the incident direction of cosmic rays changes because the secondary particles of cosmic rays are modulated by the thunderstorm electric field, which alters their incident direction, leading to variations in the reconstructed direction. This hypothesis is confirmed through the detection of actual events. Additionally, due to the differing degrees of deflection of electrons and muons in the electric field, a comparison between muon-rich and muon-poor events further supports this hypothesis.
