B. Nava
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View article: Use of Low-Cost GNSS Receivers for Ionospheric Monitoring
Use of Low-Cost GNSS Receivers for Ionospheric Monitoring Open
Electromagnetic waves propagating through the Earth’s ionosphere are subjected to changes in group and phase velocities, refraction, dispersion, and diffraction. For systems relying on the usage of radio signals affected by the ionosphere,…
View article: On the Diurnal Variation of Doppler Frequency Shift of Trans-Ionospheric Radio Waves Within Equatorial Ionospheric Anomaly Region in Africa
On the Diurnal Variation of Doppler Frequency Shift of Trans-Ionospheric Radio Waves Within Equatorial Ionospheric Anomaly Region in Africa Open
This paper examined the diurnal variation of the doppler frequency shift (DFS) of a trans-ionospheric high frequency (HF) radio wave signal within the equatorial ionospheric anomaly region. Within the framework of the International Space W…
View article: Deep neural network model for vertical total electron content prediction at a single low latitude station
Deep neural network model for vertical total electron content prediction at a single low latitude station Open
Modeling ionospheric parameters at low and equatorial stations is quite challenging due to the nature of the variation in the region. In this study, a Deep Neural Network (DNN) was configured via optimization of its hyperparameters and the…
View article: Neural Network Model for ESF Occurrence at an Equatorial Station
Neural Network Model for ESF Occurrence at an Equatorial Station Open
Equatorial Spread F (ESF) usually seen in the nighttime ionograms as diffused echo is a manifestation of the ionospheric plasma density irregularities. lifting of the F‐region ionization to the higher altitude shortly after local sunset ha…
View article: A Bootstrapping Convolutional Neural Network Technique for Optimizing Automated Detection of Equatorial Plasma Bubbles by Optical All‐Sky Imagers
A Bootstrapping Convolutional Neural Network Technique for Optimizing Automated Detection of Equatorial Plasma Bubbles by Optical All‐Sky Imagers Open
Equatorial plasma bubbles (EPBs) disrupt satellite‐based communication and navigation systems, particularly in equatorial regions. Reliable detection and classification of EPBs from all‐sky imager (ASI) images are essential for accurate sp…
View article: Enhancing the NeQuick model performance in the topside ionosphere and plasmasphere through radio occultation and POD TEC observations
Enhancing the NeQuick model performance in the topside ionosphere and plasmasphere through radio occultation and POD TEC observations Open
NeQuick is a global empirical model describing the median climatological behavior of the electron density in the ionosphere–plasmasphere system. NeQuick allows a fast calculation of total electron content (TEC) values up to GNSS heig…
View article: EclipseNB: A Network of Low‐Cost GNSS Receivers to Study the Ionosphere
EclipseNB: A Network of Low‐Cost GNSS Receivers to Study the Ionosphere Open
This work aims to demonstrate that dense networks of low‐cost dual‐frequency global navigation satellite systems (GNSS) receivers can be used to retrieve ionospheric electron content with almost the same level of accuracy as scientific‐gra…
View article: Influence of Solar Wind High‐Speed Streams on the Brazilian Low‐Latitude Ionosphere During the Descending Phase of Solar Cycle 24
Influence of Solar Wind High‐Speed Streams on the Brazilian Low‐Latitude Ionosphere During the Descending Phase of Solar Cycle 24 Open
This study investigates the Brazilian low‐latitude ionospheric response to CIR/HSS‐driven geomagnetic storms during the declining phase of solar cycle 24, from 2016 to 2017. In this period the geomagnetic storms were mostly moderate, SymH …
View article: Investigation of the global climatologic performance of ionospheric models utilizing in-situ Swarm satellite electron density measurements
Investigation of the global climatologic performance of ionospheric models utilizing in-situ Swarm satellite electron density measurements Open
The Swarm constellation is a triplet of satellites, flying, since their final configuration reached in April 2014, at altitudes of about 420 to 490 km (the lower pair) and about 500 to 530 km (the upper satellite). All the three satellites…
View article: First Results of Mars Express—ExoMars Trace Gas Orbiter Mutual Radio Occultation
First Results of Mars Express—ExoMars Trace Gas Orbiter Mutual Radio Occultation Open
Spacecraft‐to‐spacecraft radio occultations experiments are being conducted at Mars between Mars Express (MEX) and Trace Gas Orbiter (TGO), the first ever extensive inter‐spacecraft occultations at a planet other than Earth. Here we presen…
View article: Complexity and Nonlinear Dependence of Ionospheric Electron Content and Doppler Frequency Shifts in Propagating HF Radio Signals within Equatorial Regions
Complexity and Nonlinear Dependence of Ionospheric Electron Content and Doppler Frequency Shifts in Propagating HF Radio Signals within Equatorial Regions Open
The abundance of ions within the ionosphere makes it an important region for both long range and satellite communication systems. However, characterizing the complexity in the ionosphere within the equatorial region of Abuja, with geograph…
View article: Validation of the IRI-2020 topside ionosphere options through in-situ electron density observations by low-Earth-orbit satellites
Validation of the IRI-2020 topside ionosphere options through in-situ electron density observations by low-Earth-orbit satellites Open
International audience
View article: An Update of the NeQuick-Corr Topside Ionosphere Modeling Based on New Datasets
An Update of the NeQuick-Corr Topside Ionosphere Modeling Based on New Datasets Open
A new analytical formula for H0, one of the three parameters (H0, g, and r) on which the NeQuick model is based to describe the altitude profile of the electron density above the F2-layer peak height hmF2, has recently been proposed. This …
View article: Ionospheric equivalent slab thickness ingestion into the NeQuick model
Ionospheric equivalent slab thickness ingestion into the NeQuick model Open
The ionospheric equivalent slab thickness (τ), defined as the ratio of the vertical total electron content (vTEC) to the ionospheric F2-layer electron density maximum (NmF2), is a parameter providing useful information on the shape of the …
View article: Assessment of the performance of the TOPGNSS and ANN-MB antennas for ionospheric measurements using low-cost u-blox GNSS receivers
Assessment of the performance of the TOPGNSS and ANN-MB antennas for ionospheric measurements using low-cost u-blox GNSS receivers Open
Low-cost GNSS receivers have recently been gaining reliability as good candidates for ionospheric studies. In line with these gains are genuine concerns about improving the performance of these receivers. In this work, we present a compreh…
View article: The Status of Space Weather Infrastructure and Research in Africa
The Status of Space Weather Infrastructure and Research in Africa Open
Space weather science has been a growing field in Africa since 2007. This growth in infrastructure and human capital development has been accompanied by the deployment of ground-based observing infrastructure, most of which was donated by …
View article: First Results of Mars Express - ExoMars Trace Gas Orbiter Mutual Radio Occultation
First Results of Mars Express - ExoMars Trace Gas Orbiter Mutual Radio Occultation Open
Spacecraft-to-spacecraft radio occultations experiments are being conducted at Mars between the Mars Express (MEX) and Trace Gas Orbiter (TGO) spacecraft, the first ever periodic inter-spacecraft occultations at a planet other than Earth. …
View article: Modeling the Topside Ionosphere Effective Scale Height through In Situ Electron Density Observations by Low-Earth-Orbit Satellites
Modeling the Topside Ionosphere Effective Scale Height through In Situ Electron Density Observations by Low-Earth-Orbit Satellites Open
In this work, we aim to characterize the effective scale height at the ionosphere F2-layer peak (H0) by using in situ electron density (Ne) observations by Langmuir Probes (LPs) onboard the China Seismo-Electromagnetic Satellite (CSES—01).…
View article: Klobuchar, NeQuickG, BDGIM, GLONASS, IRI-2016, IRI-2012, IRI-Plas, NeQuick2, and GEMTEC Ionospheric Models: A Comparison in Total Electron Content and Positioning Domains
Klobuchar, NeQuickG, BDGIM, GLONASS, IRI-2016, IRI-2012, IRI-Plas, NeQuick2, and GEMTEC Ionospheric Models: A Comparison in Total Electron Content and Positioning Domains Open
Global navigation satellite systems (GNSS) provide a great data source about the ionosphere state. These data can be used for testing ionosphere models. We studied the performance of nine ionospheric models (Klobuchar, NeQuickG, BDGIM, GLO…
View article: Validation of the topside ionosphere description made by the International Reference Ionosphere model through in-situ satellites, GNSS radio occultation, and incoherent scatter radars observations
Validation of the topside ionosphere description made by the International Reference Ionosphere model through in-situ satellites, GNSS radio occultation, and incoherent scatter radars observations Open
The International Reference Ionosphere (IRI) is an empirical model describing the primary ionospheric parameters based on the long data record from ground-based ionospheric observatories and space-based satellite missions.IRI describes the…