Spatial Characteristics of GNSS Fading and Scintillation in Low Latitudes

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dc.contributor.authorDi Santis, Victor
dc.contributor.authorMoraes, Alison
dc.contributor.authorCosta, Emanoel
dc.contributor.authorSousasantos, Jonas
dc.contributor.authorSilva, Paulo Renato Pereira
dc.contributor.authorSouza, Ana Lucia Christovam de
dc.date.accessioned2026-02-10T18:09:45Z
dc.date.available2026-02-10T18:09:45Z
dc.date.issued22025
dc.description.abstractPrevious studies evaluated several characteristics of ionospheric fading events and amplitude scintillation. However, a detailed analysis on how the fading profiles and scintillation probabilities vary according to the dip latitude is still required. In this work, a statistical analysis of data from four ground-based scintillation monitors was performed to evaluate how the α coefficient (first parameter of the “α–μ” probability distribution model); the deepest fading occurrence; the number of fading events per minute; and the duration of fading events change according to the dip latitudes of the ionospheric pierce points (IPPs) of transionospheric propagation paths. The results reveal a nuanced spatial variation in amplitude scintillation, emphasizing an enhanced severity within the equatorial ionization anomaly (EIA) southern crest, resulting in a clear increase in the probability of severe fading events. An increasing trend in the α fading coefficient at more poleward dip latitudes was found, in comparison with results from equatorward locations, suggesting an asymmetry favoring more severe fading events within the former region. The average fad- ing occurrences are significantly larger over the EIA peak region, especially for increasing scintillation levels. Complementary Cumulative Distribution Function (CCDF) curves demonstrate peak probabilities between dip latitudes from − 14.5° to − 10.5° for higher scintillation levels, also displaying an asymmetrical pattern around the EIA boundaries. This study provides important insights on the spatial dynamics of scintillation and fading profiles, enhancing the understanding of low-latitude ionospheric effects on global network satellite system (GNSS) signals.
dc.description.physical32 p.
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.uriFAPESP: 2017/01150–0 CAPES: 850937/2023–00, 88887.901203/2023–00 CNPq: 465648/2014–2, 309389/2021–6
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationInstituto Tecnológico de Aeronáutica
dc.identifier.affiliationInstituto de Aeronáutica e Espaço
dc.identifier.affiliationUniversidade de Taubaté
dc.identifier.affiliationPontifícia Universidade Católica do Rio de Janeiro
dc.identifier.affiliationUniversity of Texas
dc.identifier.bibliographicCitationDI SANTIS, Victor et al. Spatial Characteristics of GNSS Fading and Scintillation in Low Latitudes. Surveys in Geophysics, v. 46, n. 5, p. 907-938, 2025. Disponível em: 10.1007/s10712-025-09897-5.
dc.identifier.doi10.1007/s10712-025-09897-5
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/1145
dc.language.isoen_US
dc.publisherSpringer Nature Link
dc.rights.holderSurveys in Geophysics
dc.subject.keywordIonospheric scintillation
dc.subject.keywordEquatorial plasma bubbles
dc.subject.keywordGNSS fading characterization
dc.titleSpatial Characteristics of GNSS Fading and Scintillation in Low Latitudes
dc.typeArtigos de Periódicos

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