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<p>Buenos días: </p>
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<p>Les comunicamos que el Seminario FCAG se ha reprogramado para
el<b> día de hoy a las 13h, en el aula H</b>. A continuación les
reenviamos la información.</p>
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<p>Los invitamos a asistir, <b>hoy 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>.
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<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>
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