The GRAPES-3 tracking muon telescope, located at Ooty, records short-term variations in the muon intensity during major thunderstorms, termed thunderstorm-induced muon events (TIMEs). Its excellent angular resolution, coupled with high statistics, allows us to observe subtle directional variations in muon rate. We detected 169 statistically significant events during the five-year period from 2006 through 2010. The monthly and seasonal variation patterns of the observed TIMEs were discussed, emphasizing their occurrence and climatological aspects. The annual diurnal pattern was plotted with the Carnegie curve, considering their possible causal link with the global electric circuit. The work represents the first report from any experiment for such an extended period in an uninterrupted manner [1]. The present status of TIMEs study will be updated [2–4].
Reference:
1. P. K. Nayak et al., Observation of thunderstorm-induced muon events in GRAPES-3 experiment, J. Atmos. Solar-Terr. Phys., 258 (2024) 106231.
2. P. K. Nayak et al., The Ooty muon telescope reveals what climate did in 2022 summer, Indian Journal of Physics (2024) (available online on 17 March 2024).
3. P. K. Nayak et al., Seasonal variation of thunderstorm-induced muon events observed at GRAPES-3, PoS (ICRC2023) 403.
4. P. K. Nayak et al., Contemplating the observed relationship between the global electric circuit and GRAPES-3 thunderstorm-induced muon events, PoS (ICRC2023) 404.
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