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Effects of atmospheric electric field on muon intensity observed in GRAPES-3 experiment

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conference contribution
posted on 2023-10-24, 21:49 authored by B Hariharan, S R Dugad, S K Gupta, Y Hayashi, P Jagadeesan, A Jain, S Kawakami, P K Mohanty, P K Nayak, B S Rao
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0). During bad weather conditions, muon flux above 1 GeV observed in GRAPES-3 muon telescope shows large variations. The atmospheric electric field is believed to be responsible for acceleration of cosmic ray muons. A thunderstorm event observed on 30 September 2015 is discussed here. The field of view of large area (560 m2) tracking muon telescope at GRAPES-3 allows study of muon intensity variations in 169 directions with ∼4° resolution. This event shows large decrease in North-East directions, with a maximum decrease of -0.6% in all directions combined and -4.5% in a single direction. Muons from selected directions were combined and processed with fast Fourier transform (FFT) to remove slow and ultra-fast variations (Af = 10-200 cycles per day). The filtered data shows maximum decrease of -1.2% with statistical significance of 9<7. Monte Carlo simulations were carried out with modified CORSIKA package to incorporate electric field. Simulations show that electric potential ∼1 GV is needed to get variation of 1% in GRAPES-3 muon flux.

History

Volume

301

Location

Bexco, Busan, Korea

Start date

2017-07-12

End date

2017-07-20

eISSN

1824-8039

Publication classification

E2.1 Full written paper - non-refereed / Abstract reviewed

Title of proceedings

Proceedings of Science: 35th International Cosmic Ray Conference (ICRC2017)

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