<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Buenas tardes:<br>
</p>
<p>Les comunicamos que se ha reprogramado para el<b> día de mañana a
las 13h, en el aula H</b>, el Seminario FCAG. A continuación les
reenviamos la información.</p>
<p>----------------<br>
</p>
<p>Los invitamos a asistir, <b>mañana jueves 22 de mayo a las 13h</b>
en el <b>Aula H</b>, al Seminario FCAG <b>"A Rare Convergence of
Polar and Equatorial Ionospheric Disturbances During a
Geomagnetic Superstorm: Merging, Coupling, or Coexistence?"</b>.
El mismo estará a cargo del <b>Dr. Giorgio Picanço</b> <b>(Physics
and Astronomy Laboratory, Research and Development Institute,
University of the Paraíba Valley -IP&D/UNIVAP-, São José dos
Campos, SP, Brazil)</b>, Profesor invitado de MAGGIA<span
id="docs-internal-guid-cb2b013f-7fff-526c-a890-b182d87de733"><span
style="color: rgb(0, 0, 0); background-color: transparent; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">.</span></span>
En esta oportunidad, el Seminario se brindará de manera <b>presencial</b>.
</p>
<div class="moz-forward-container">
<div class="moz-forward-container">
<div class="moz-forward-container">
<div class="moz-forward-container">
<p><b><span
style="color: rgb(0, 0, 0); background-color: transparent; font-style: normal; font-variant: normal; text-decoration: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space: pre-wrap;"></span></b></p>
<p dir="ltr"
style="line-height:1.2;text-align: justify;margin-top:0pt;margin-bottom:0pt;"><b
style="font-weight:normal;"
id="docs-internal-guid-df8f69cf-7fff-ae4c-f3ff-0504fe5968c7"><span
style="color: rgb(0, 0, 0); background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"></span></b><span
id="gmail-docs-internal-guid-b5b0a747-7fff-9217-dc76-56bb98c672bb"> </span></p>
<p dir="ltr"
style="line-height:1.38;text-align:justify;margin-top:12pt;margin-bottom:12pt"><span
style="color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;font-variant-alternates:normal;vertical-align:baseline"></span><b
style="font-weight:normal;"
id="docs-internal-guid-a84204b0-7fff-cae1-e76f-47cdcccb6ceb"> </b></p>
<p dir="ltr"
style="line-height:1.2;text-align: justify;margin-top:0pt;margin-bottom:0pt;"><b
style="font-weight:normal;"
id="docs-internal-guid-a84204b0-7fff-cae1-e76f-47cdcccb6ceb"><span
style="color: rgb(0, 0, 0); background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><b>Resumen:</b> </span></b><span
lang="en-US">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.</span></p>
<b style="font-weight:normal;"
id="docs-internal-guid-a84204b0-7fff-cae1-e76f-47cdcccb6ceb"> </b><b
style="font-weight:normal;"
id="docs-internal-guid-a84204b0-7fff-cae1-e76f-47cdcccb6ceb"><br>
</b><b style="font-weight:normal;"
id="docs-internal-guid-df8f69cf-7fff-ae4c-f3ff-0504fe5968c7"><b
style="font-weight:normal;"
id="docs-internal-guid-31694089-7fff-b265-c01b-3a9b823daa1c"><span
style="color: rgb(0, 0, 0); background-color: transparent; font-weight: 700; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">A fin de reducir el uso de residuos plásticos, les solicitamos que se acerquen con sus propias tazas para el café. </span></b>
</b>
<p><b style="font-weight:normal;"
id="docs-internal-guid-df8f69cf-7fff-ae4c-f3ff-0504fe5968c7">Saludos, </b></p>
<b style="font-weight:normal;"
id="docs-internal-guid-df8f69cf-7fff-ae4c-f3ff-0504fe5968c7">SeCyT-FCAG</b>
<pre class="moz-signature" cols="72">--
Secretaría de Ciencia y Técnica
Facultad de Ciencias Astronómicas y Geofísicas
Horario de atención: lunes a viernes de 8hs a 15hs</pre>
</div>
</div>
</div>
</div>
</body>
</html>