SEMINARS
SEMINARS - 2026
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Speaker: MSc. Roberto Livy da Costa Madeira Affiliation: Space Geophysics Postgraduate Program - PGGES/INPE Date/time: April 23, 2026, at 2pm Location: Roger Honiat Auditorium (LIT building) Title: On the relations between spectral and temporal parameters of the ionospheric scintillation phenomenon observed by a stand-alone GNSS receiver at Cachoeira Paulista in Brazil. Abstract: Among the topics of greatest interest in aeronomy today, equatorial ionospheric scintillation of the GNSS (global navigation satellite system) signals stands out. It is defined as the rapid variation of amplitude and phase of the signals that crossed the disturbed low latitudinal ionosphere. The observed phenomenon, by receivers, depends on the characteristic scale length of the irregularities that develop within the equatorial plasma bubbles under a cascade process. In this work, we collect intensity data from a geostationary satellite at 5°W and present empirical evidence supporting the possibility of probing and modeling properties of ionospheric irregularities over Brazil using a stand-alone receiver in Cachoeira Paulista. In particular, we show that, under the frozen-in hypothesis, the characteristic frequency of the intensity scintillation spectrum is inversely proportional to the decorrelation time, which, in turn, is inversely proportional to the drift velocity. |
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Speaker: Dr. Erico L. Rempel Affiliation: Department of Mathematics, ITA and DGE/INPE Date: April 15, 2026, at 2 PM Location: Barclay Clemesha Auditorium, CEA II building, at INPE headquarters in São José dos Campos (Av. dos Astronautas, 1758, Jardim da Granja) Title: LAGRANGIAN COHERENT STRUCTURES IN SPACE PLASMAS Abstract: Space plasmas can be described as turbulent conductive flows, where the fluid motion is determined by a series of coherent kinetic and magnetic structures of different types. Identifying and monitoring the evolution of these structures is crucial for a deep understanding and, possibly, for predicting plasma behavior. Lagrangian coherent structures constitute a recently developed theory to describe the transport of materials in fluids, with carefully crafted mathematical approaches to detect the main transport barriers responsible for controlling fluid flows. In this work, we review the application of this theory to space plasmas using numerical simulations and satellite observations. In particular, the results show that Lagrangian coherent structures can be used to better understand complex plasma phenomena in the solar atmosphere. |
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Speaker: Dr. Diego Janches Affiliation: NASA Goddard Space Flight Center, Greenbelt, United States Date: April 14, 2026, at 2pm Location: Barclay Clemesha Auditorium, CEA II building, at INPE headquarters in São José dos Campos (Av. dos Astronautas, 1758, Jardim da Granja) Title: Global Network of Meteor Radars: A Critical Atmospheric Capability for Space Weather Operations Abstract: This talk highlights the importance of a global network of meteor radars as a key observational system for monitoring the upper atmosphere. It discusses how these measurements are obtained and provides critical data on winds, and variability that directly impacts spatial weather operations. The presentation emphasizes the role of coordinated international observations in improving forecasting capabilities and supporting both scientific research and operational needs. |
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Speaker: Prof. Dr. Walmir Thomazzi Cardoso (UFRJ) Date: April 8, 2026 Location: Barclay Clemesha Auditorium, CEA II building, INPE headquarters in São José dos Campos (Av. dos Astronautas, 1758, Jardim da Granja) Seminar Title: We are under many skies: Cultural Astronomy as a field of academic research. Abstract: Where we see a scorpion in the sky, the Tukano indigenous people of the Upper Rio Negro see a jararaca snake, and some Guarani villages see part of the body of a rhea. Beyond distinct arrangements and designs in the sky, these representations reveal part of the complex relationships existing in each culture, including their conceptions of the natural world. In times of global climate change, what can we learn from the sky-earth relationships locally established by human groups? |
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Speaker: Jean Carlo Santos Affiliation: National Institute for Space Research (INPE) Date: April 01, 2026, at 2pm Location: Barclay Clemesha Auditorium, CEA II building, at INPE headquarters in São José dos Campos (Av. dos Astronautas, 1758, Jardim da Granja)
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Speaker: Dr. Ramon E. Lopez Distinguished Researcher and Professor Member, U.T. System & U.T. Arlington Academy of Distinguished Teachers Department of Physics, University of Texas at Arlington Date/Time: March 26, 2:00 PM Location: Barclay Clemesha Auditorium, CEA II building, INPE headquarters in São José dos Campos (Av. dos Astronautas, 1758, Jardim da Granja) Title: Magnetospheres and the possibility of life on other planets. Language: English |
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Speaker: Walter D. Gonzalez Affiliation: National Institute for Space Research (INPE) Date: March 11, 2026 at 10am Location: Barclay Clemesha Auditorium, CEA II building, INPE headquarters in São José dos Campos (Av. dos Astronautas, 1758, Jardim da Granja) Title: SMILE Mission Abstract: The SMILE (Solar Wind - Magnetosphere - Ionosphere Link Explorer) mission, from ESA (European Space Agency) and CAS (Chinese Academy of Sciences), expected to launch in April 2026 (and be placed in an elliptical orbit with an apogee of 30 Earth radii and inclined relative to the ecliptic), aims to monitor fundamental aspects of the interaction of the solar wind with the Earth's magnetosphere, using sensors to measure plasma and interplanetary magnetic field, X-ray emission from the magnetosheath and the The study will explore the magnetopause, as well as UV emission from the auroral region. These measurements are expected to provide a better understanding of global aspects of the magnetopause and the auroral region, particularly during periods of intense geomagnetic storms and sub-storms.
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