PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - CRI - Cosmic Ray Indirect
A lightning detection system for studying transient phenomena in cosmic ray observatories
J. Peña Rodríguez*, P. Salgado-Meza, L. Flórez-Villegas, J. Peña-Rodríguez and L.A. Núñez
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Pre-published on: July 08, 2021
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Transients of the atmospheric electric field could cause anomalous events in the surface particle detectors of cosmic ray observatories. A better understanding of these incidents requires more accurate lightning data at the observation sites. We present the design and implementation of a monitoring system capable of detecting and storing lightning discharges. The acquisition window per event contains information of the first return stroke and the subsequent ones during 1.2 seconds at a sampling frequency of 100 kHz. The acquisition timing resolution (10 ns) allows a lightning strike location error < 10 m. The station also records environmental data, containing temperature, barometric pressure, relative humidity, and steady-state atmospheric electric field. A GPS receiver provides the absolute time of the station. 3-dimensional mapping of lightning discharge can be reconstructed in detail using a monitoring network of at least three stations.
We present preliminary measurements during a thunderstorm episode (2019-11- 09). The event lasts about 2 hours, recording a maximum electric field peak of ~-15 kV/m. The atmospheric potential was ~27 MV with an estimated thunderstorm cloud-base height of ~2 km. At least four lightning events occurred during the thunderstorm period. Such discharges released an electric field >5 kV/m.
DOI: https://doi.org/10.22323/1.395.0253
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