Simultaneous observations of multiple ELVES and SPRITES at the Pierre Auger Observatory

Since 2014, the Pierre Auger Observatory has exploited a dedicated trigger and its very high time resolution to study ELVES and harvest record samples of multiple ELVES using the Fluorescence Detector (FD). In 2017, after extending the readout of trace lengths to 0.9 ms, we started observing other types of light transients from the base of the ionosphere, such as HALOS, which deserved further investigation. In December 2023 and April 2024, we installed two additional cameras (TLECAMs), which allow us to perform simultaneous detection of these transients with higher space resolution and longer integration times. Here, we present our first simultaneous observations of SPRITES and ELVES by both TLECAMs and FD. Furthermore, we describe the Python algorithm based on DBSCAN to automatically detect SPRITES in the videos recorded by our TLECAMs and acquire data efficiently without needing the FD trigger.

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Published
2025-09-24
DOI
https://doi.org/10.22323/1.501.0342
Primary Topic
Astronomical Observations and Instrumentation
Type
article
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article

Simultaneous observations of multiple ELVES and SPRITES at the Pierre Auger Observatory

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Astronomical Observations and Instrumentation
article

Simultaneous observations of multiple ELVES and SPRITES at the Pierre Auger Observatory

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Abstract

Since 2014, the Pierre Auger Observatory has exploited a dedicated trigger and its very high time resolution to study ELVES and harvest record samples of multiple ELVES using the Fluorescence Detector (FD). In 2017, after extending the readout of trace lengths to 0.9 ms, we started observing other types of light transients from the base of the ionosphere, such as HALOS, which deserved further investigation. In December 2023 and April 2024, we installed two additional cameras (TLECAMs), which allow us to perform simultaneous detection of these transients with higher space resolution and longer integration times. Here, we present our first simultaneous observations of SPRITES and ELVES by both TLECAMs and FD. Furthermore, we describe the Python algorithm based on DBSCAN to automatically detect SPRITES in the videos recorded by our TLECAMs and acquire data efficiently without needing the FD trigger.

Strong, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Fundação de Amparo à Pesquisa do Estado de São Paulo, Bundesministerium für Bildung und Forschung, Fonds De La Recherche Scientifique - FNRS, Consejo Nacional de Investigaciones Científicas y Técnicas, Fonds Wetenschappelijk Onderzoek, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Centre National de la Recherche Scientifique, Financiadora de Estudos e Projetos, Istituto Nazionale di Astrofisica, Ministério da Ciência, Tecnologia, Inovações e Comunicações, Vlaamse regering, Istituto Nazionale di Fisica Nucleare, Ministerium für Kultur und Wissenschaft des Landes Nordrhein-Westfalen, Helmholtz Alliance for Astroparticle Physics, Agencia Nacional de Promoción Científica y Tecnológica, Institut National de Physique Nucléaire et de Physique des Particules
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Astronomical Observations and Instrumentation
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