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<p>Buenas tardes, </p>
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<p> los invitamos a asistir, el próximo<b> viernes 23 de mayo
a las 14h</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>,<b> </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>
<p><b><span
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style="line-height:1.2;text-align: justify;margin-top:0pt;margin-bottom:0pt;"><b
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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>
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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>
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</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>
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<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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