Strong Ionospheric Spatial Gradient Events Induced by Signal Propagation Paths Aligned With Equatorial Plasma Bubbles

Affonso, Bruno J.; Moraes, Alison de Oliveira; Sousasantos, Jonas; Marini-Pereira, Leonardo; Pullen, Sam

doi:10.1109/taes.2022.3144622

Cited by 17 publications

(5 citation statements)

References 31 publications

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“…Figure 7 exemplifies a study case for a receiver at São José dos Campos (23.20°S, 45.85° W, geomagnetic latitude 19.28°S) on the night of 17 November 2014. Extending this study, in Affonso et al (2022), it was evidenced that this alignment condition also causes severe ionospheric gradients that can be threatening for GBAS operation. Their results showed a 10% probability of occurrence of critical gradients exceeding 400 mm•km -1 while nonaligned cases reached only 0.2%.…”

Section: Statistical Modeling Of Ionospheric Scintillationsupporting

confidence: 52%

The GNSS NavAer INCT Project Overview and Main Results

Monico

Paula

Moraes

et al. 2022

J. Aerosp. Technol. Manag.

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Air navigation is increasingly dependent on the use of Global Navigation Satellite Systems (GNSS). It allows the determination of the aircraft's position in all phases of the flight and brings many advantages. Although GNSS navigation results in gains, the radio signals from these systems are strongly influenced by the ionospheric environment. It introduces errors that can affect the accuracy, integrity, availability and continuity requirements established by the International Civil Aviation Organization (ICAO). The ionospheric layer has different behaviors depending on the latitude, time of day, season of the year, geomagnetic activity and solar cycle. Since Brazil is located in a region of low latitudes, it experiences a series of unique challenges when compared to regions of mid-latitudes. For this reason, the application of GNSS-based technologies in aviation over the Brazilian territory requires an in-depth assessment of the ionosphere effects. Therefore, the Instituto Nacional de Ciência e Tecnologia (INCT) named GNSS Technology for Supporting Air Navigation was formed in 2017 to better assess the ionosphere impacts and assist government agencies and companies in the development of safe air navigation procedures over Brazil in a near future. This paper presents the most relevant advances achieved so far within this multidisciplinary project that involves Brazilian research centers and universities.

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Section: Statistical Modeling Of Ionospheric Scintillationsupporting

confidence: 52%

The GNSS NavAer INCT Project Overview and Main Results

Monico

Paula

Moraes

et al. 2022

J. Aerosp. Technol. Manag.

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“…Complementing these works, Affonso et al. (2022) analyzed in detail the alignment condition and showed that, over low‐latitude regions, this is a source of strong ionospheric gradients. However, several aspects remain uncovered and requiring further investigation.…”

Section: Transionospheric Signals and The Epbs Field‐aligned Naturementioning

confidence: 99%

Amplitude Scintillation Severity and Fading Profiles Under Alignment Between GPS Propagation Paths and Equatorial Plasma Bubbles

et al. 2022

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The low-latitude ionospheric phenomenology has strong influence over transionospheric signals such as those used by the Global Navigation Satellite System (GNSS) (Basu et al., 1988;Kintner et al., 2001). In this dynamic environment, during nighttime, the development of large depletions in the ionospheric plasma density, known as Equatorial Plasma Bubbles (EPBs), may interfere in the satellite links in different ways. There are two major issues of interest regarding GNSS signals over low latitudes, the ionospheric

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“…Although not reaching the | | ∇TEC upper bound in existing SBAS and GBAS threat models Yoon et al, 2017), this compensated value is generally on par with typical magnitudes of TEC gradients observed experimentally at low-latitude locations (Pradipta & Doherty, 2016;Chang et al, 2021;Affonso et al, 2022). Regardless, the objective here is not to match the absolute upper bound ∇TEC.…”

Section: Comparative Analysis and Characterizationmentioning

confidence: 84%

Can Numerical Simulations of Equatorial Plasma Bubble Plume Structures be Simplified for Operational and Practical Usage?

Pradipta,

Carrano,

Groves,

et al. 2024

navi

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We argue the merits of having a simplified method to simulate equatorial plasma bubble (EPB) plume structures for practical usage. The capability to realistically model EPB plume structures in simulations would be advantageous when assessing the severity of ionospheric threats. Such advantages would arise because a realistic model of EPB plume structures could allow nonstationary scintillation signals to be simulated. Although EPB plume structures can be modeled via first-principle physics-based models, these models tend to be computationally demanding. High-performance computing facilities might be able to offer some remedy, but serious handicaps would remain for those without access to such advanced facilities. We investigated multiple options that utilize the diffusion-limited aggregation (DLA) fractal process to generate bifurcating structures that resemble typical EPB plume structures. We combined the DLA algorithm with the International Reference Ionosphere model to simulate EPBs in three dimensions. Initial tests of this modeling approach indicate promising results.

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Strong Ionospheric Spatial Gradient Events Induced by Signal Propagation Paths Aligned With Equatorial Plasma Bubbles

Cited by 17 publications

References 31 publications

The GNSS NavAer INCT Project Overview and Main Results

The GNSS NavAer INCT Project Overview and Main Results

Amplitude Scintillation Severity and Fading Profiles Under Alignment Between GPS Propagation Paths and Equatorial Plasma Bubbles

Can Numerical Simulations of Equatorial Plasma Bubble Plume Structures be Simplified for Operational and Practical Usage?

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