[Graduados] HOY Seminario FCAG - 22/05 - 13:00h "A Rare Convergence of Polar and Equatorial Ionospheric Disturbances During a Geomagnetic Superstorm: Merging, Coupling, or Coexistence?" - Dr. Giorgio Picanço (IP&D/UNIVAP, Brasil)

[Secretaría de Ciencia y Técnica]

Buenos días:

Les comunicamos que el Seminario FCAG se ha reprogramado para el*día de 
hoy a las 13h, en el aula H*. A continuación les reenviamos la información.

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Los invitamos a asistir, *hoy jueves 22 de mayo a las 13h* en el *Aula 
H*, al Seminario FCAG *"A Rare Convergence of Polar and Equatorial 
Ionospheric Disturbances During a Geomagnetic Superstorm: Merging, 
Coupling, or Coexistence?"*. El mismo estará a cargo del *Dr. Giorgio 
Picanço* *(Physics and Astronomy Laboratory, Research and Development 
Institute, University of the Paraíba Valley -IP&D/UNIVAP-, São José dos 
Campos, SP, Brazil)*, Profesor invitado de MAGGIA. En esta oportunidad, 
el Seminario se brindará de manera *presencial*.

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**Resumen:* *In this study, we present a multi-instrumental analysis of 
the extreme geomagnetic storm of October 10, 2024, focusing on the 
interaction between Equatorial Plasma Bubbles (EPBs) and Large-Scale 
Traveling Ionospheric Disturbances (LSTIDs) over the American sector. 
Using Rate of Total Electron Content Index (ROTI) and Detrended Total 
Electron Content (DTEC) maps derived from Global Navigation Satellite 
System (GNSS) data, we investigated the ionospheric response to the 
geomagnetic storm. This analysis was complemented by far-ultraviolet 
airglow observations from the Global-scale Observations of the Limb and 
Disk (GOLD) mission, in situ electron density profiles from the Swarm 
satellite constellation, and ground-based ionosonde measurements. These 
multi-instrumental datasets revealed a sequence of coupled processes 
responsible for the generation, expansion, and morphological deformation 
of EPBs, extending well beyond their typical equatorial domain. Prompt 
Penetration Electric Fields (PPEFs), which led to an enhanced 
pre-reversal enhancement (PRE) over western South America, drove a 
substantial uplift of the ionospheric F-region, exceeding 700 km, and 
favored the development of large-scale EPBs. These structures manifested 
as a reversed-C-shaped plasma depletion band, confirmed by both ROTI and 
GOLD observations. Simultaneously, DTEC maps and keograms revealed the 
equatorward propagation of storm-time LSTIDs. A pronounced spatial and 
temporal overlap between EPB and LSTID signatures was observed at 
midlatitudes, especially across the western South American longitudinal 
sector. This interaction appears to have modulated the outer structure 
of the EPBs, leading to asymmetric deformation and enhanced latitudinal 
expansion. Finally, our findings highlight the role of multiscale 
coupling between high-latitude and equatorial processes during 
geomagnetic storms and emphasize the need for integrated observations to 
fully characterize the dynamics of storm-induced ionospheric disturbances.

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***A fin de reducir el uso de residuos plásticos, les solicitamos que se 
acerquen con sus propias tazas para el café. * *

*Saludos, *

*SeCyT-FCAG*

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Secretaría de Ciencia y Técnica
Facultad de Ciencias Astronómicas y Geofísicas
Horario de atención: lunes a viernes de 8hs a 15hs
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