Classification and Reconstruction of single and multiple ELVES in AUGER

ROBERTO MUSSA; PIERRE AUGER COLLABORATION; M. GABRIELA NICORA

Simposio; AtmoHEAD 2022; 2022

the Pierre Auger Observatory, exploiting a dedicated trigger and extended readout. A largefraction of the observed events shows double ELVES within the time window, and, in somecases, even more complex structures are observed. We classify double ELVES using the radialvariation of the time gap and the photon flux ratio between flashes. Such parameters may berelated to the different types of lightning in which they originated. We will review the crosscorrelations of the ELVES light emissions with the radio waves detected by the antennas of theENTLN network, active in Argentina since late 2018. Further improvements of our detectionand classification algorithms were achieved by detecting ELVES from closer lightning: sinceDecember 2020, the ELVES trigger was extended to the three High Elevation AugerTelescopes (HEAT), which observe the night sky at elevation angles between 30 and 60degrees, with an enhanced time resolution (50 ns time binning). Both single and double ELVESare recorded with unprecedented time and space resolution. Events from the first year of datataking will be shown.