Seasonal variation of thunderstorm-induced muon events observed at GRAPES-3
August 09, 2023
The thunderstorm-induced muon events (TIMEs) are observed when the strong electric fields in thunderstorms modulate muon acceleration, resulting in their altered count rate at the observational level. Because of the GRAPES-3 experiment’s remarkable directional accuracy, it is well-suited for investigating these TIMEs. May shows the maximum number of observed events, whereas the minimum is in January. The spring (from March to May) was the season with the most frequent, followed by autumn (from September to November), summer (June to August), and winter (December to February). The number of events during spring and autumn is well-correlated with the warmer pre-southwest and relatively colder northeastern monsoon seasons, respectively. Surprisingly fewer events were observed during the summer, and only a few were observed during winter.
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