Spatial Characteristics of GNSS Fading and Scintillation in Low Latitudes

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dc.contributor.authorSantis, Victor Di
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.accessioned2026-02-11T18:06:01Z
dc.date.available2026-02-11T18:06:01Z
dc.date.issued22025-10
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 alpha coefficient (first parameter of the "alpha-mu" 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 alpha 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 fading 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 degrees to - 10.5 degrees 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.format.mimetypepdf
dc.identifier.affiliationInstituto Tecnológico de Aeronáutica
dc.identifier.affiliationInstituto de Aeronáutica e Espaço
dc.identifier.affiliationPontifícia Universidade Católica do Rio de Janeiro
dc.identifier.affiliationUniversity of Texas at Dallas
dc.identifier.affiliationInstituto Tecnológico de Aeronáutica
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.bibliographicCitationSANTIS, V. D.; MORAES, A.; COSTA, E.; SOUSASANTOS, J.; SILVA, P. R. P.; SOUZA, A. L. C. de. Spatial Characteristics of GNSS Fading and Scintillation in Low Latitudes. Surveys in Geophysics, [S. l.], v. 46, n. 5, p. 907–938, out. 2025. https://doi.org/10.1007/s10712-025-09897-5.
dc.identifier.doi10.1007/s10712-025-09897-5
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/1148
dc.language.isoen_US
dc.publisherSpringer Nature
dc.rights.holderVictor Di Santis
dc.rights.holderAlison Moraes
dc.rights.holderEmanoel Costa
dc.rights.holderJonas Sousasantos
dc.rights.holderPaulo Renato Pereira Silva
dc.rights.holderAna Lucia Christovam Souza
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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