J. R. Souza
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View article: Morphological Study of Plasma Bubbles Using All‐Sky Airglow Images and Numerical Simulations: Brazilian Sector
Morphological Study of Plasma Bubbles Using All‐Sky Airglow Images and Numerical Simulations: Brazilian Sector Open
This study meticulously examines the morphology of ionospheric plasma depletions, or bubbles, using OI 630 nm airglow all‐sky images captured over three Brazilian observatories: Santarém, Bom Jesus da lapa, and Cariri. The analysis focuses…
View article: Comparison of Total Electron Content (TEC) Maps over Brazil from Different Sources
Comparison of Total Electron Content (TEC) Maps over Brazil from Different Sources Open
Total Electron Content (TEC) allows to evaluate the state of the ionosphere. Radio waves like GNSS signals traversing the ionosphere suffer delays and refraction. Ionospheric plasma irregularities may be generated in the equatorial regions…
View article: Slightly-deformed clouds of enhanced mesospheric sodium and potassium concentration over the SAMA region: a case study
Slightly-deformed clouds of enhanced mesospheric sodium and potassium concentration over the SAMA region: a case study Open
This work investigates a slightly-deformed cloud of enhanced mesospheric sodium (Na) and potassium (K) layers registered on 24 June 2023 by the dual-beam Na/K LIDAR system operating over the low-latitude sector of São José dos Campos - Bra…
View article: Overview of the early campaign diagnostics for the SPARC tokamak (invited)
Overview of the early campaign diagnostics for the SPARC tokamak (invited) Open
The SPARC tokamak is a high-field, Bt0 ∼12 T, medium-sized, R0 = 1.85 m, tokamak that is presently under construction in Devens, MA, led by Commonwealth Fusion Systems. It will be used to de-risk the high-field tokamak path to a fusion pow…
View article: Impacts of Storm Electric Fields and Traveling Atmospheric Disturbances Over the Americas During 23–24 April 2023 Geomagnetic Storm: Experimental Analysis
Impacts of Storm Electric Fields and Traveling Atmospheric Disturbances Over the Americas During 23–24 April 2023 Geomagnetic Storm: Experimental Analysis Open
The paper presents the effects of the storm‐time prompt penetration electric fields (PPEF) and traveling atmospheric disturbances (TADs) on the total electron content (TEC), foF2 and hmF2 in the American sector (north and south) during the…
View article: Climatology of atmospheric solar tidal mode effects on ionospheric F2 parameters over the American sector during solar minimum between cycles #23 and #24
Climatology of atmospheric solar tidal mode effects on ionospheric F2 parameters over the American sector during solar minimum between cycles #23 and #24 Open
This work presents the contribution of solar atmospheric tides (diurnal, semidiurnal, and terdiurnal modes) to the variability of the parameters critical frequency ( foF 2 ) and peak height of the F 2 -layer ( hmF 2 ) in the American secto…
View article: Functional Impact Prediction of CFTR Gene Variants in Indigenous Populations of Brazil
Functional Impact Prediction of CFTR Gene Variants in Indigenous Populations of Brazil Open
Cystic Fibrosis (CF) is a condition resulting from dysfunction in the CFTR protein, leading to a multisystemic disease of ion imbalance that increases the viscosity of mucus produced in epithelial cel
View article: Spectral Contamination of the 6300 Å Emission in Single‐Etalon Fabry‐Perot Interferometers
Spectral Contamination of the 6300 Å Emission in Single‐Etalon Fabry‐Perot Interferometers Open
The spectral line profile of the atomic oxygen O 1 D 2 — 3 P 2 transition near 6300 Å in the airglow has been used for more than 50 years to extract neutral wind and temperature information from the F‐region ionosphere. A new spectral mode…
View article: Spectral Contamination of the 6300Å Emission in Single-Etalon Fabry-Perot Interferometers - Data
Spectral Contamination of the 6300Å Emission in Single-Etalon Fabry-Perot Interferometers - Data Open
Raw ".fit" image data files from Santarem Brazil and from Cachoeira Paulista Brazil are included. These raw data are used to create Figures 8, 9b, 10 and 13 of the titled publication. Filenames with prefix "bb" are CCD image exposures from…
View article: Spectral Contamination of the 6300Å Emission in Single-Etalon Fabry-Perot Interferometers - Data
Spectral Contamination of the 6300Å Emission in Single-Etalon Fabry-Perot Interferometers - Data Open
Raw ".fit" image data files from Santarem Brazil and from Cachoeira Paulista Brazil are included. These raw data are used to create Figures 8, 9b, 10 and 13 of the titled publication. Filenames with prefix "bb" are CCD image exposures from…
View article: Thermospheric neutral wind and temperature over Cachoeira Paulista
Thermospheric neutral wind and temperature over Cachoeira Paulista Open
The data sets are observations of thermospheric neutral winds and temperatures which can be used to study the dynamics of low latitude ionosphere in Brazil. The data have been organized by Dr Jonas R. Souza ([email protected]) from Natio…
View article: Thermospheric neutral wind and temperature over Cachoeira Paulista
Thermospheric neutral wind and temperature over Cachoeira Paulista Open
The data sets are observations of thermospheric neutral winds and temperatures which can be used to study the dynamics of low latitude ionosphere in Brazil. The data have been organized by Dr Jonas R. Souza ([email protected]) from Natio…
View article: Ionospheric Variability over the Brazilian Equatorial Region during the Minima Solar Cycles 1996 and 2009: Comparison between Observational Data and the IRI Model
Ionospheric Variability over the Brazilian Equatorial Region during the Minima Solar Cycles 1996 and 2009: Comparison between Observational Data and the IRI Model Open
The behavior of the Brazilian equatorial ionosphere during the solar minimum periods, 1996 and 2009, which cover the solar cycles 22/23 and 23/24, respectively, is investigated. For this, the F2 layer critical frequency (foF2) and peak hei…
View article: Ionospheric response modeling under eclipse conditions: Evaluation of 14 December 2020, total solar eclipse prediction over the South American sector
Ionospheric response modeling under eclipse conditions: Evaluation of 14 December 2020, total solar eclipse prediction over the South American sector Open
In this work, we evaluate the SUPIM-INPE model prediction of the 14 December 2020, total solar eclipse over the South American continent. We compare the predictions with data from multiple instruments for monitoring the ionosphere and with…
View article: Solar Flare and Radio Burst Effects on GNSS Signals and the Ionosphere During September 2017
Solar Flare and Radio Burst Effects on GNSS Signals and the Ionosphere During September 2017 Open
Strong solar flare events can occur even during the decay phase of the solar cycle. During these events concurrent increases in the X‐ray and Enhanced UV (EUV) fluxes and solar radio bursts (SRBs) can be observed. The SRBs cover a large ra…
View article: Responses of intermediate layers to geomagnetic activity during the 2009 deep solar minimum over the Brazilian low-latitude sector
Responses of intermediate layers to geomagnetic activity during the 2009 deep solar minimum over the Brazilian low-latitude sector Open
This work presents the daytime behavior of the intermediate layer (ILs) parameters (the virtual height – h'IL, and the top frequency – ftIL) over the low-latitude region of Cachoeria Paulista (CP, 22.42∘ S; 45∘ W, I: −34.59∘) during the 20…
View article: The GNSS NavAer INCT Project Overview and Main Results
The GNSS NavAer INCT Project Overview and Main Results Open
Made available in DSpace on 2022-04-29T08:41:19Z (GMT). No. of bitstreams: 0\n Previous issue date: 2022-01-01
View article: Anomalous responses of the F 2 layer over the Brazilian equatorial sector during a counter electrojet event: a case study
Anomalous responses of the F 2 layer over the Brazilian equatorial sector during a counter electrojet event: a case study Open
Key Points: • Gravity waves impacts in the anomalous responses of the F layer over Brazil during a counter electrojet event; • Some signatures in ionograms suggest the gravity wave as responsible for the CEJ occurrence in this day. Abstrac…
View article: Thermospheric neutral wind and temperature over Cachoeira Paulista
Thermospheric neutral wind and temperature over Cachoeira Paulista Open
The datasets are observations of thermospheric neutral winds and temperatures recorded by a Fabry-Perot interferometer. These data can be used to study the dynamics of the low-latitude ionosphere in Brazil. The data were organized by Dr. J…
View article: Thermospheric neutral wind and temperature over Cachoeira Paulista
Thermospheric neutral wind and temperature over Cachoeira Paulista Open
The datasets are observations of thermospheric neutral winds and temperatures recorded by a Fabry-Perot interferometer. These data can be used to study the dynamics of the low-latitude ionosphere in Brazil. The data were organized by Dr. J…
View article: Reply on RC1
Reply on RC1 Open
Abstract. This work presents the daytime behavior of the intermediate layer (ILs) parameters (the virtual height â h'IL, and the top frequency â ftIL) over the low-latitude region of Cachoeria Paulista (CP, 22.42ââS; 45ââW, I: …
View article: Intermediate Layers responses to Geomagnetic Activity During the 2009 Deep Solar Minimum Over the Brazilian Low Latitude Sector
Intermediate Layers responses to Geomagnetic Activity During the 2009 Deep Solar Minimum Over the Brazilian Low Latitude Sector Open
Intermediate layers (ILs) are regions of enhanced electron density located in the ionospheric valley that extends from the peak altitude of the daytime E-region to the bottom side of the F-region. This work presents the daytime behavior of…
View article: L‐Band Synthetic Aperture Radar Observation of Ionospheric Density Irregularities at Equatorial Plasma Depletion Region
L‐Band Synthetic Aperture Radar Observation of Ionospheric Density Irregularities at Equatorial Plasma Depletion Region Open
Plasma density irregularities in the equatorial ionosphere are thought to cause the distortions of L‐band Synthetic Aperture Radar (SAR) images, which have been observed in recent years, but the origin of the image distortion has not yet b…
View article: Some Differences in the Dynamics of the Intermediate Descending Layers Observed During Periods of Maximum and Minimum Solar Flux
Some Differences in the Dynamics of the Intermediate Descending Layers Observed During Periods of Maximum and Minimum Solar Flux Open
In this paper, ionograms from São Luís (SL, 2°S; 44°W, I: −3.8°) and Cachoeira Paulista (CP, 22.42°S; 45°W, I: −34.4°) are analyzed to examine the characteristics of the intermediate descending layers (ILs) over the Brazilian equatorial an…
View article: Ionosonde total electron content evaluation using International Global Navigation Satellite System Service data
Ionosonde total electron content evaluation using International Global Navigation Satellite System Service data Open
In this work, a period of 2 years (2016–2017) of ionospheric total electron content (ITEC) from ionosondes operating in Brazil is compared to the International GNSS (Global Navigation Satellite System) Service (IGS) vertical total electron…
View article: Climatology of intermediate descending layers (or 150 km echoes) over the equatorial and low-latitude regions of Brazil during the deep solar minimum of 2009
Climatology of intermediate descending layers (or 150 km echoes) over the equatorial and low-latitude regions of Brazil during the deep solar minimum of 2009 Open
In this work, we have performed a study for the first time on the climatology of the intermediate descending layers (ILs) over Brazilian equatorial and low-latitude regions during the extreme solar minimum period of 2009. The result of thi…
View article: Evaluation of ionospheric models for Central and South Americas
Evaluation of ionospheric models for Central and South Americas Open
This work shows a 20-month statistical evaluation of different Total Electron Content (TEC) estimators for the Central and South America regions. The TEC provided by the International GNSS Service (IGS) in the area covered around the monit…
View article: Ionosonde Total Electron Content Evaluation Using IGS Data
Ionosonde Total Electron Content Evaluation Using IGS Data Open
In this work, a period of two years (2016–2017) of vertical total electron content (VTEC) from ionosondes operating in Brazil is compared to the International GNSS Service (IGS) data. Sounding instruments from National Institute for Space …
View article: Ionospheric Plasma Bubble Zonal Drift Derived From Total Electron Content Measurements
Ionospheric Plasma Bubble Zonal Drift Derived From Total Electron Content Measurements Open
Equatorial plasma bubbles consist of field‐aligned large‐scale depletions, or irregularities, characterized by drastic ion density rarefactions of the nocturnal low latitude/equatorial ionosphere. Understanding their behavior is important …
View article: Climatology of intermediate descending layers (150 km) over the equatorial and low latitude regions of Brazil during the deep solar minimum of 2009
Climatology of intermediate descending layers (150 km) over the equatorial and low latitude regions of Brazil during the deep solar minimum of 2009 Open
In this work, we report for the first time the climatology of intermediate descending layers over Brazilian equatorial and low latitudes regions during the extreme solar minimum period of 2009. The occurrence frequency of this layer is ver…