Space and Planetary Science, Physics and Astronomy, Geophysics, General Physics and Astronomy
32
Scopus Publications
291
Scholar Citations
10
Scholar h-index
13
Scholar i10-index
Scopus Publications
Extra Ionization Causing the Anomalous Auroral Sporadic E Layer (Esa) Over the Equatorial Brazilian Region During the Recovery Phase of the Magnetic Storm on 10 May 2024 L. C. A. Resende, Y. Zhu, R. A. J. Chagas, C. M. Denardini, K. V. S. Espinosa, S. S. Chen, L. A. Da Silva, L. R. Alves, J. Moro, S. R. Laranja, A. M. Santos, V. F. Andrioli, L. L. Campos, J. P. Marchezi, J. R. Costa, C. Wang, H. Li, Z. Liu Space Weather, 2025 The center of the South American Magnetic Anomaly (SAMA), located in southern Brazil, is characterized by enhanced energetic particle precipitation (EPP) at low energies (<40 keV), which can significantly impact the ionosphere during intense geomagnetic storms. Typically confined to high latitudes, sporadic auroral E layers (Es a ) have been observed near the SAMA center, particularly during storm recovery phases. However, during the intense geomagnetic storm on 10 May 2024, the Es a layer was detected for the first time over the equatorial Brazilian station Belém (BLM, 1.45°S, 48.49°W, dip = −2.5°). Simultaneously, blanketing Es layers were also observed during the storm's recovery phase, indicating that wind shear mechanisms were also occurring. Satellite data revealed that EPP‐induced ionization extended equatorward beyond the central region of the SAMA, reaching latitudes not previously associated with such effects. Concurrently, disturbed electric fields led to a weakening of the equatorial electrojet (EEJ), inhibiting the development of typical equatorial plasma irregularities. Numerical simulations using the E Region Ionospheric Model confirmed that low‐energy electron precipitation with energy (E) < 2 keV contributed to the observed enhancement in Es layer electron density. These findings provide the first evidence that the occurrence of the Es a layers at equatorial latitudes results from a combination of physical processes, including EPP, wind shear dynamics, and electrodynamic disturbances.
Using Machine Learning Explainability Techniques to Examine Drivers of Ground Magnetic Field Localization Michael Coughlan, Amy Keesee, Victor Pinto, Raman Mukundan, José Paulo Marchezi, Mayowa Adewuyi, Joel Tibbetts, Jeremiah Johnson, Hyunju Connor, Don Hampton Space Weather, 2025 Solar wind particles interact with the Earth's magnetic field and can cause rapid changes in the magnetic field on the ground. This can result in Geomagnetically Induced Currents capable of causing significant damage to infrastructure, making it vital to predict when and where the fluctuations will occur so the impact can be limited. The fluctuations can occur on both a large and highly localized scale, further complicating precise predictions. Machine learning (ML) techniques have emerged as an effective method of predicting space weather phenomena, with their largest complication being their lack of explainability. Here we seek to use such ML methods, combined with a model explainability technique called SHapley Additive exPlanation to both predict and times of extreme localization. Using L1 solar wind data and magnetometer data from SuperMAG, we train two different types of models, one predicting extreme and one predicting large Region‐to‐Specific Difference (RSD). We are seeking to forecast the maximum of RSD and within a rolling 60‐min window, beginning 30 min in the future. The models perform well across a variety of latitudes and Magnetic Local times. While traditional drivers of space weather ( and ) are important drivers of the ML models, other not often examined parameters (particularly ) exhibit non‐uniform spatial and latitudinal dependencies which cannot be attributed to correlation with more influential parameters. Additionally, the inertia of the internal geomagnetic field on a regional scale exhibits a more nuanced behavior compared to previous studies on individual magnetometer stations.
Temporal and Latitudinal Occurrences of Geomagnetic Pulsations Recorded in South America by the Embrace Magnetometer Network Jose Paulo Marchezi, Odim Mendes, Clezio Marcos Denardini Atmosphere, 2025 This study investigates the occurrence and distribution of geomagnetic pulsations (Pc2–Pc5) over South America during 2014, analyzing their dependence on magnetic latitude, local time, and geomagnetic activity. Geomagnetic field data were obtained from the Embrace magnetometer network, which spans Brazil and Argentina and includes regions influenced by the Equatorial Electrojet (EEJ) and the South Atlantic Magnetic Anomaly (SAMA). Both continuous and discrete wavelet transforms (CWT and DWT) were employed to analyze non-stationary signals and reconstruct pulsation activity during quiet and disturbed geomagnetic periods. The results reveal that Pc5 and Pc3 pulsations exhibit a pronounced diurnal peak around local noon, with significantly stronger and more widespread activity under storm conditions. Spatial analyses highlight localized enhancements near the dip equator during quiet times and broader latitudinal spread during geomagnetic disturbances. These findings underscore the strong modulation of pulsation activity by geomagnetic conditions and offer new insights into wave behavior at low and mid-latitudes. This work contributes to understanding magnetosphere–ionosphere coupling and has implications for space weather prediction and geomagnetically induced current (GIC) risk assessment in the South American sector.
Localized geomagnetic disturbances: a statistical analysis of spatial scale Raman Mukundan, Amy M. Keesee, José Paulo Marchezi, Victor A. Pinto, Michael Coughlan, Donald Hampton Frontiers in Astronomy and Space Sciences, 2025 Geomagnetically induced currents (GICs) pose a significant space weather hazard, driven by geomagnetic field variation due to the coupling of the solar wind to the magnetosphere-ionosphere system. Extensive research has been dedicated to understanding ground-level geomagnetic field perturbations as a GIC proxy. Still, the non-uniform aspect of geomagnetic fluctuations make it difficult to fully characterize the ground-level magnetic field across large regions of the globe. Here, we focus on localized geomagnetic disturbances (LGMDs) in the North American region and specify the degree to which these disturbances are localized. Employing the electrodynamics-informed Spherical Elementary Current Systems (SECS) method, we spatially interpolate magnetic field perturbations between ground-based magnetometer stations. In this way, we represent the ground magnetic field as a series of heatmaps at high temporal and spatial resolution. We leverage heatmaps from storm time during solar cycle 24 to automatically identify LGMDs. We build a statistical picture of the frequency with which LGMDs occur, their scale sizes, and their latitude-longitude aspect ratios. Additionally, we use an information theory approach to quantify the dependence of these three attributes on the phase of the solar cycle. We find no clear influence of the solar cycle on any of the three attributes. We offer some avenues toward explaining why LGMDs might behave broadly the same whether they arise during solar maximum or solar minimum.
Comparative Analysis of Data Augmentation Methods for Well Log Data J. Marchezi, E. Leite, A. Delgado, O. Bokhonok, G. Hartmann, et al. 86th Eage Annual Conference and Exhibition, 2025 Summary This study evaluates data augmentation methods for enhancing well log datasets, crucial for subsurface exploration but often limited by data scarcity. Techniques like Principal Component Analysis (PCA), Variational Autoencoders (VAEs), and Generative Adversarial Networks (GANs) were compared for their ability to generate synthetic datasets that retain the statistical, geological, and petrophysical consistency of original data. The analysis utilized multivariate log profiles from the Búzios oil field in Brazil. PCA, a computationally efficient method, struggled with non-linear relationships, generating less diverse synthetic data. VAEs encoded data into latent space, generating realistic samples with competitive performance but required careful tuning. GANs excelled in creating highly realistic and diverse datasets, effectively capturing central tendencies and outliers, but were prone to challenges like mode collapse. Results showed GANs performed best for features with high variability, while VAEs excelled in low-variability features. PCA underperformed in modeling complex, non-linear relationships. The findings highlight the importance of method selection based on feature characteristics. Future work will explore hybrid approaches and scaling these techniques for broader applications in subsurface characterization. The study underscores data augmentation’s role in addressing data scarcity, enhancing machine learning model robustness, and improving reservoir characterization.
Space weather effects over SAMA during the extreme geomagnetic storm on May 10-11, 2024: disturbances of the neutral and ionized atmosphere Ligia Alves Da Silva, Jiankui Shi, Lívia R. Alves, Laysa Cristina Araújo Resende, Luis Eduardo Antunes Vieira, Joaquim Eduardo Rezende Costa, Jose Paulo Marchezi, Oleksiy V. Agapitov, David Gary Sibeck, Angela Machado dos Santos, Vania Fatima Andrioli, Paulo Ricardo Jauer, Vinicius Deggeroni, Carolina de Sousa do Carmo, Prosper Kwamla Nyassor, Sony Su Chen, Toyese Tunde Ayorinde, Karen Júlia Coldebella Ferreira, Juliano Moro, Chi Wang, Hui Li, Zhengkuan Liu Frontiers in Astronomy and Space Sciences, 2025 A complex active region in the Sun’s photosphere from 8 May 2024, produced seven halo-type Coronal Mass Ejections (CMEs) following extreme solar flares. These events generated Solar Energetic Particles (SEPs) that propagated toward Earth, culminating in an extreme geomagnetic storm (SYM-H = −497 nT) from May 10 to 13 May 2024. This study analyzes the Sun’s photosphere, interplanetary medium, inner radiation belt, and the space weather impacts on the neutral atmosphere and E and F ionospheric layers over the South Atlantic Magnetic Anomaly (SAMA) during the storm’s main phase. The first and second Interplanetary CMEs (ICMEs) reached Earth’s bow shock at 15:00 UT and 17:00 UT on May 10, respectively. The second ICME, associated with a shock, caused a significant displacement of the dayside magnetopause (∼6 Earth radii, RE) and the first solar wind Poynting flux transfer into the magnetosphere (Akasofu parameter, Epsilon ∼ 1 × 1013 W). At 18:00 UT, the third ICME and its associated shock pushed the magnetopause further to ∼5 RE and added energy to the magnetospheric budget (Epsilon ∼2.5 × 1013 W). Between 19:00 and 21:00 UT, the solar wind proton density (&gt;40 cm-3) peaked at Earth’s bow shock, but no energy input to the magnetosphere occurred (Epsilon ∼0 W). Low-energy electron/ion fluxes vanished in the inner radiation belt. Epsilon gradually increased between 21:00 and 22:30 UT, coinciding with the onset of low-energy electron/ion injections into the inner radiation belt and substorm activity. These injections persisted after 22:30 UT, albeit limited to specific energy levels. Enhanced energetic particle precipitation (EPP) and local particle acceleration caused significant variability in electron/ion fluxes in the inner radiation belt. Increased scattering by plasma waves precipitated particles into the SAMA atmosphere, raising ionization rates and depleting ozone in the mesosphere and stratosphere. Extra ionization in the E ionospheric region further indicated auroral-like effects in this low-latitude region during the storm’s main phase.
Ultra-relativistic electron flux enhancement under persistent high speed solar wind stream L. R. Alves, L. A. da Silva, V. Deggeroni, J. P. Marchezi, P. R. Jauer, G. B. D. Silva, D. G. Sibeck Frontiers in Astronomy and Space Sciences, 2024 The physical mechanisms usually applied to explain the relativistic electron enhancement have been delved into to elucidate non-adiabatic electron acceleration resulting in the ultra-relativistic electron population observed in the outer radiation belt. We considered multisatellite observations of the solar wind parameters, magnetospheric waves, and particle flux to report an unusual local acceleration of ultra-relativistic electrons under a prolonged high-speed solar wind stream (HSS). A corotating interaction region reaches the Earth’s bowshock on August 3, 2016, causing a minor geomagnetic storm. Following this, the magnetosphere was driven for 72 h by a long-term HSS propagating at 600 km/s. During this period, the magnetosphere sustained both ultra-low frequency (ULF) and very-low frequency (VLF) waves in the outer radiation belt region. Besides the waves, the relativistic and ultra-relativistic electron fluxes were enhanced with different time lags regarding the magnetic storm main phase. The efficiency of wave-particle interaction in enhancing ultrarelativistic electrons is evaluated by the diffusion coefficient rates, considering both ULF and VLF waves together with phase space density analyses. Results show that local acceleration by whistler mode chorus waves can occur in a time scale of 2–4 h, whereas ULF waves take around 10’s of hours and magnetosonic waves take a time scale of days. This result is confirmed by the phase space density analysis. Accordingly, it shows that peaks of local acceleration of 1 MeV electrons are consistent with the observation of the highest chorus wave amplitude at the same L-shell and MLT. Thus, we argue that whistler mode chorus waves interacting with relativistic electrons are the main physical mechanisms leading to ultra-relativistic electron enhancement, while ULF and fast magnetosonic waves are found as secondary physical processes. Lastly, our analysis contributes to understanding how whistler and ULF waves can contribute to ultra-relativistic electrons showing up in the inner magnetosphere under the HSS driver.
High-Energy Electron Flux Enhancement Pattern in the Outer Radiation Belt in Response to the Interplanetary Coronal Mass Ejections L. A. Da Silva, J. Shi, J. P. Marchezi, O. V. Agapitov, D. Sibeck, L. R. Alves, L. E. A. Vieira, V. Deggeroni, L. C. A. Resende, R. Lopez, J. E. R. Costa, C. Wang, J. Moro, H. Li, A. Dal Lago, K. J. C. Ferreira, A. Inostroza, Z. Liu Journal of Geophysical Research Space Physics, 2023 The high‐energy electron flux enhancement pattern in the outer radiation belt is observed under the influence of the Interplanetary Coronal Mass Ejections (ICMEs). Ten events were selected during the Van Allen Probes era, with the high‐energy electron flux enhancement starting close to L* = 4. A schematic diagram of the main physical processes responsible for this kind of high‐energy electron flux enhancement is presented, considering the energy deposited in the inner magnetosphere under the influence of ICMEs. Superposed Epoch Analysis is applied to the interplanetary medium parameters, the magnetopause standoff distance, the storm‐time geomagnetic activity indices, the Ultra‐Low Frequency (ULF) waves, and the whistler‐mode chorus waves. A compressed magnetopause, Bz component preferentially southward and storm indices considerably high are observed at the beginning of the electron flux enhancements. The modeled parameters of the chorus waves at the dayside/nightside sectors show the high acceleration efficiency at the beginning of the electron flux enhancement pattern II. These results suggest that the local acceleration driven by chorus waves is essential to these electron flux enhancements at low L*. In contrast, although the ULF waves are detected at the beginning of the studied electron flux enhancements, their contribution is insignificant.
Probabilistic Forecasting of Ground Magnetic Perturbation Spikes at Mid-Latitude Stations Michael Coughlan, Amy Keesee, Victor Pinto, Raman Mukundan, José Paulo Marchezi, Jeremiah Johnson, Hyunju Connor, Don Hampton Space Weather, 2023 The prediction of large fluctuations in the ground magnetic field (dB/dt) is essential for preventing damage from Geomagnetically Induced Currents. Directly forecasting these fluctuations has proven difficult, but accurately determining the risk of extreme events can allow for the worst of the damage to be prevented. Here we trained Convolutional Neural Network models for eight mid‐latitude magnetometers to predict the probability that dB/dt will exceed the 99th percentile threshold 30–60 min in the future. Two model frameworks were compared, a model trained using solar wind data from the Advanced Composition Explorer (ACE) satellite, and another model trained on both ACE and SuperMAG ground magnetometer data. The models were compared to examine if the addition of current ground magnetometer data significantly improved the forecasts of dB/dt in the future prediction window. A bootstrapping method was employed using a random split of the training and validation data to provide a measure of uncertainty in model predictions. The models were evaluated on the ground truth data during eight geomagnetic storms and a suite of evaluation metrics are presented. The models were also compared to a persistence model to ensure that the model using both datasets did not over‐rely on dB/dt values in making its predictions. Overall, we find that the models using both the solar wind and ground magnetometer data had better metric scores than the solar wind only and persistence models, and was able to capture more spatially localized variations in the dB/dt threshold crossings.
The 14 December 2020 Total Solar Eclipse Effects on Geomagnetic Field Variations and Plasma Density Over South America S. S. Chen, L. C. A. Resende, C. M. Denardini, R. A. J. Chagas, L. A. Da Silva, J. P. Marchezi, J. Moro, P. A. B. Nogueira, A. M. Santos, P. R. Jauer, C. S. Carmo, G. A. S. Picanço, R. P. Silva Journal of Geophysical Research Space Physics, 2023 We discuss the effects in the geomagnetic field variations and ionospheric plasma density modifications caused by the Total Solar Eclipse that occurred on 14 December 2020 over the South American sector. We used ground‐based magnetometer data and the Total Electron Content maps derived from the Global Navigation Satellite System to evaluate these changes. The results show that the geomagnetic field daily variation weakens between the first and last solar eclipse penumbra contact. Additionally, we observed a significant reduction of about 52.33 nT on the Equatorial Electrojet strength at Jicamarca (11.95°S, 76.88°W), where the solar obscuration reached 16.67% approximately. This behavior indicates that the solar eclipse in the equatorial region has possibly affected electric conductivities, altering the E region dynamo electric field. Consequently, it weakens the equatorial plasma fountain, affecting the Equatorial Ionization Anomaly development. Additionally, the ionospheric dynamics variations over Jicamarca during the solar eclipse event are analyzed using ionosonde data. We observe that the solar eclipse also caused a modification in the sporadic E layer and F region dynamics, indicating possible evidence of the gravity wave occurrence. Therefore, the results found here provide a better understanding of how the solar eclipse passage in the equatorial region affects the electron density in the low‐latitude regions.
The Role of Solar Wind Structures in the Generation of ULF Waves in the Inner Magnetosphere L. R. Alves, V. M. Souza, P. R. Jauer, L. A. da Silva, C. Medeiros, C. R. Braga, M. V. Alves, D. Koga, J. P. Marchezi, R. R. S. de Mendonça, R. S. Dallaqua, M. V. G. Barbosa, M. Rockenbach, A. Dal Lago, O. Mendes, L. E. A. Vieira, M. Banik, D. G. Sibeck, S. G. Kanekal, D. N. Baker, J. R. Wygant, C. A. Kletzing Solar Physics, 2017
Comparison of geophysical patterns in the southern hemisphere mid-latitude region L.A. Da Silva, P. Satyamurty, L.R. Alves, V.M. Souza, P.R. Jauer, M.V.D. Silveira, M.S. Echer, R. Hajra, C. Medeiros, J.P. Marchezi, M. Rockenbach, N.R. Rigozo, C.M. Denardini, O. Mendes, A. Dal Lago, L.E.A. Vieira Advances in Space Research, 2016
15th Symposium on Small Satellite Missions (B4): 12th UN/IAA Workshop on Small Satellite Programmes at the Service of Developing Countries (1) 62nd International Astronautical Congress 2011 Iac 2011, 2011
RECENT SCHOLAR PUBLICATIONS
Stratigraphically Constrained Well-Log Data Augmentation for Angle-Stack AVO Forward Modelling O Bokhonok, JP Marchezi, LAD Blanco, EPP Leite, G Hartman, A Batezelli EGU26 , 2026 2026
Impact of Generative AI and Statistical Data Augmentation in Synthetic Well-Log Generation for Seismic Porosity Inversion: A Comparative Study JP Marchezi, E Leite, O Bokhnok, L Delgado, G Hartman, A Batezelli EGU26 , 2026 2026
On the Effects of the Solar Wind Structure in the Global Distribution of Spikes During Geomagnetic Storms JP Marchezi, AM Keesee, MK Coughlan, R Mukundan, VA Pinto, ... ESS Open Archive 2026 (0110) , 2026 2026
Extra Ionization Causing the Anomalous Auroral Sporadic E Layer (Es a ) Over the Equatorial Brazilian Region During the Recovery Phase of the Magnetic Storm on … LCA Resende, Y Zhu, RAJ Chagas, CM Denardini, KVS Espinosa, ... Space Weather 23 (12), e2025SW004669 , 2025 2025
Localized geomagnetic disturbances: a statistical analysis of spatial scale R Mukundan, AM Keesee, JP Marchezi, VA Pinto, M Coughlan, ... Frontiers in Astronomy and Space Sciences 12, 1610276 , 2025 2025
Using machine learning explainability techniques to examine drivers of ground magnetic field localization M Coughlan, A Keesee, V Pinto, R Mukundan, JP Marchezi, M Adewuyi, ... Space Weather 23 (8), e2025SW004391 , 2025 2025 Citations: 2
Temporal and Latitudinal Occurrences of Geomagnetic Pulsations Recorded in South America by the Embrace Magnetometer Network JP Marchezi, O Mendes, CM Denardini Atmosphere 16 (6), 742 , 2025 2025
Comparative Analysis of Data Augmentation Methods for Well Log Data J Marchezi, E Leite, A Delgado, O Bokhonok, G Hartmann, A Batezelli 86th EAGE Annual Conference & Exhibition 2025 (1), 1-5 , 2025 2025
Space weather effects over SAMA during the extreme geomagnetic storm on May 10-11, 2024: disturbances of the neutral and ionized atmosphere LA Da Silva, J Shi, LR Alves, LCA Resende, LEA Vieira, JER Costa, ... Frontiers in Astronomy and Space Sciences 12, 1550635 , 2025 2025 Citations: 5
Out with the Old, In with the New: Incorporating Recent Storm Data to Refine Forecasting Intense Geomagnetic Storms A Flores, M Coughlan, R Mukundan, VA Pinto, JP Marchezi, AM Keesee AGU Fall Meeting Abstracts 2024 (27), SM21C-27 , 2024 2024
Sytematic Discovery of the Relationships between Localized Geomagnetic Disturbances and the Solar Wind R Mukundan, AM Keesee, JP Marchezi, VA Pinto, M Coughlan, ... AGU Fall Meeting Abstracts 2024 (2703), SM21C-2703 , 2024 2024
Evaluation of gap-filling for OMNI data. How much data is it safe to interpolate? VA Pinto, M Coughlan, R Mukundan, JP Marchezi, AM Keesee AGU Fall Meeting Abstracts 2024 (2694), SM21C-2694 , 2024 2024
Latitudinal and MLT distribution of dB/dt spikes during geomagnetic storms from 1995 to 2021 during Coronal Mass Ejection and High-Speed Stream events. JP Marchezi, AM Keesee, M Coughlan, R Mukundan, VA Pinto, ... AGU Fall Meeting Abstracts 2024 (3562), GP43B-3562 , 2024 2024
Using Superposed Epoch Analysis and Shapley Values to Examine Drivers of Localized dB/dt M Coughlan, AM Keesee, VA Pinto, R Mukundan, JP Marchezi, ... AGU Fall Meeting Abstracts 2024 (2704), SM21C-2704 , 2024 2024
Ultra-relativistic electron flux enhancement under persistent high speed solar wind stream LR Alves, LA Da Silva, V Deggeroni, JP Marchezi, PR Jauer, GBD Silva, ... Frontiers in Astronomy and Space Sciences 11, 1478489 , 2024 2024 Citations: 1
Probabilistic Predictions of Geomagnetic Field Perturbations and Using Explainability Methods to Uncover Drivers of the Localization Effect M Coughlan, A Keesee, V Pinto, R Mukundan, JP Marchezi, J Johnson, ... Authorea Preprints , 2024 2024
Local Acceleration of Relativistic Electrons to Ultra-Relativistic Energy Due to Fast Magnetosonic Waves and Whistler-Mode Chorus Waves LR Alves, LA da Silva, GBD Silva, JP Marchezi, K Coldebella, DG Sibeck, ... 2024 United States National Committee of URSI National Radio Science Meeting … , 2024 2024
Outer radiation belt electron flux response to enhanced solar wind speed daily average. LR Alves, L da Silva, GBD da Silva, DM Schaefer, JP Marchezi, PR Jauer, ... AGU23 , 2023 2023
Forecasting 1-hour Ahead Ground Magnetic Field Maximum Perturbations With Deep Learning Models VA Pinto, AM Keesee, M Coughlan, R Mukundan, JP Marchezi, ... AGU Fall Meeting Abstracts 2023 (621), NG13B-0621 , 2023 2023
Electron Flux Variability in the Outer Radiation Belt Under the Influence of Supercritical Interplanetary Quasi-parallel Shock Waves K Ferreira, LA Da Silva, LR Alves, JP Marchezi, V Deggeroni, GBD Silva AGU Fall Meeting Abstracts 2023 (2571), SM13B-2571 , 2023 2023
MOST CITED SCHOLAR PUBLICATIONS
Outer radiation belt dropout dynamics following the arrival of two interplanetary coronal mass ejections LR Alves, LA Da Silva, VM Souza, DG Sibeck, PR Jauer, LEA Vieira, ... Geophysical Research Letters 43 (3), 978-987 , 2016 2016 Citations: 34
New findings relating tidal variability and solar activity in the low latitude MLT region VF Andrioli, J Xu, PP Batista, LCA Resende, LA Da Silva, JP Marchezi, ... Journal of Geophysical Research: Space Physics 127 (3), e2021JA030239 , 2022 2022 Citations: 25
Contribution of ULF wave activity to the global recovery of the outer radiation belt during the passage of a high‐speed solar wind stream observed in September 2014 LA Da Silva, D Sibeck, LR Alves, VM Souza, PR Jauer, SG Claudepierre, ... Journal of Geophysical Research: Space Physics 124 (3), 1660-1678 , 2019 2019 Citations: 21
The role of the inner radiation belt dynamic in the generation of auroral-type sporadic E-layers over south American magnetic anomaly LA Da Silva, J Shi, LCA Resende, OV Agapitov, LR Alves, IS Batista, ... Frontiers in Astronomy and Space Sciences 9, 970308 , 2022 2022 Citations: 19
High‐energy electron flux enhancement pattern in the outer radiation belt in response to the Alfvénic fluctuations within high‐speed solar wind stream: A statistical analysis LA Da Silva, J Shi, LR Alves, D Sibeck, JP Marchezi, C Medeiros, ... Journal of Geophysical Research: Space Physics 126 (8), e2021JA029363 , 2021 2021 Citations: 19
A multi-instrumental and modeling analysis of the ionospheric responses to the solar eclipse on 14 December 2020 over the Brazilian region LCA Resende, Y Zhu, CM Denardini, SS Chen, RAJ Chagas, LA Da Silva, ... Annales Geophysicae 40 (2), 191-203 , 2022 2022 Citations: 18
Dynamic mechanisms associated with high‐energy electron flux dropout in the Earth's outer radiation belt under the influence of a coronal mass ejection sheath region LA Da Silva, J Shi, LR Alves, D Sibeck, VM Souza, JP Marchezi, ... Journal of Geophysical Research: Space Physics 126 (1) , 2021 2021 Citations: 16
Analysis of the different physical mechanisms in the atypical sporadic E (Es) layer occurrence over a low latitude region in the Brazilian sector LCA Resende, Y Zhu, CM Denardini, RAJ Chagas, LA Da Silva, ... Frontiers in Astronomy and Space Sciences 10, 1193268 , 2023 2023 Citations: 15
Acceleration of radiation belt electrons and the role of the average interplanetary magnetic field B z component in high‐speed streams VM Souza, RE Lopez, PR Jauer, DG Sibeck, K Pham, LA Da Silva, ... Journal of Geophysical Research: Space Physics 122 (10), 10,084-10,101 , 2017 2017 Citations: 14
Why can the auroral-type sporadic E layer be detected over the South America Magnetic Anomaly (SAMA) region? An investigation of a case study under the influence of the high … LA Da Silva, J Shi, LE Vieira, OV Agapitov, LCA Resende, LR Alves, ... Frontiers in Astronomy and Space Sciences 10, 1197430 , 2023 2023 Citations: 11
Worldwide study of the Sporadic E (Es) layer development during a space weather event LCA Resende, Y Zhu, CM Denardini, J Moro, LA Da Silva, C Arras, ... Journal of Atmospheric and Solar-Terrestrial Physics 241, 105966 , 2022 2022 Citations: 10
A global magnetohydrodynamic simulation study of ultra-low-frequency wave activity in the inner magnetosphere: corotating interaction region+ alfvénic fluctuations PR Jauer, C Wang, VM Souza, MV Alves, LR Alves, MB Pádua, ... The Astrophysical Journal 886 (1), 59 , 2019 2019 Citations: 10
On the contribution of EMIC waves to the reconfiguration of the relativistic electron butterfly pitch angle distribution shape on 2014 September 12—A case study C Medeiros, VM Souza, LEA Vieira, DG Sibeck, AJ Halford, SB Kang, ... The Astrophysical Journal 872 (1), 36 , 2019 2019 Citations: 10
Probabilistic forecasting of ground magnetic perturbation spikes at mid‐latitude stations M Coughlan, A Keesee, V Pinto, R Mukundan, JP Marchezi, J Johnson, ... Space Weather 21 (6), e2023SW003446 , 2023 2023 Citations: 9
Electron flux variability and ultra‐low frequency wave activity in the outer radiation belt under the influence of interplanetary coronal mass ejections and high‐speed solar … JP Marchezi, L Dai, LR Alves, LA Da Silva, DG Sibeck, AD Lago, ... Journal of Geophysical Research: Space Physics 127 (8), e2021JA029887 , 2022 2022 Citations: 9
Analysis of the sporadic-E layer behavior in different American stations during the days around the september 2017 geomagnetic storm LCA Resende, Y Zhu, C Arras, CM Denardini, SS Chen, J Moro, D Barros, ... Atmosphere 13 (10), 1714 , 2022 2022 Citations: 8
Comparison of geophysical patterns in the southern hemisphere mid-latitude region LA Da Silva, P Satyamurty, LR Alves, VM Souza, PR Jauer, MVD Silveira, ... Advances in Space Research 58 (10), 2090-2103 , 2016 2016 Citations: 8
High‐energy electron flux enhancement pattern in the outer radiation belt in response to the interplanetary coronal mass ejections LA Da Silva, J Shi, JP Marchezi, OV Agapitov, D Sibeck, LR Alves, ... Journal of Geophysical Research: Space Physics 128 (11), e2023JA031360 , 2023 2023 Citations: 7
The role of solar wind structures in the generation of ULF waves in the inner magnetosphere LR Alves, VM Souza, PR Jauer, LA Da Silva, C Medeiros, CR Braga, ... Solar Physics 292 (7), 92 , 2017 2017 Citations: 6
Space weather effects over SAMA during the extreme geomagnetic storm on May 10-11, 2024: disturbances of the neutral and ionized atmosphere LA Da Silva, J Shi, LR Alves, LCA Resende, LEA Vieira, JER Costa, ... Frontiers in Astronomy and Space Sciences 12, 1550635 , 2025 2025 Citations: 5
