@Article{SilvaSoMaLoMoAb:2021:EvDuEa,
               author = "Silva, Andr{\'e} L. A. and Sousasantos, J. and Marini Pereira, L. 
                         and Louren{\c{c}}o, L. F. D. and Moraes, A. O. and Abdu, 
                         Mangalathayil Ali",
          affiliation = "{Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and 
                         {Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and 
                         {Instituto de Controle do Espa{\c{c}}o A{\'e}reo (ICEA)} and 
                         Embraer and {Instituto de Aeron{\'a}utica e Espa{\c{c}}o (IAE)} 
                         and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Evaluation of the dusk and early nighttime Total Electron Content 
                         modeling over the eastern Brazilian region during a solar maximum 
                         period",
              journal = "Advances in Space Research",
                 year = "2021",
               volume = "67",
               number = "5",
                pages = "1580--1598",
                month = "Mar.",
             keywords = "GNSS, Single frequency users, Ionospheric delay, Ionospheric 
                         models, Low latitude regions.",
             abstract = "The ionosphere is one of the main sources of errors for the GNSS 
                         (Global Navigation Satellite System) users in low-latitude 
                         regions. The ionosphere delays the signal propagation, directly 
                         influencing the pseudorange estimation, which is fundamental for 
                         positioning estimation. This study aims at evaluating empirical 
                         and theoretical models that generate profiles of Total Electron 
                         Content (TEC), with respect to their ability to represent the 
                         spatiotemporal distribution of the ionospheric plasma. For this 
                         purpose, the TEC data calculated from measurements obtained by 
                         receivers from the Brazilian Network for Continuous Monitoring of 
                         GNSS Systems (RBMC) were compared with ionospheric models that 
                         provide the TEC values. The TEC calculation procedure is presented 
                         in the manuscript. The Klobuchar model, the empirical model 
                         IRI-2016, which has the NeQuick model integrated in its 
                         calculations, and the SAMI2 model were evaluated. Data from 2 
                         years around solar maximum period was used considering averaged 
                         values over Brazilian region. The evaluations carried out between 
                         the TEC values obtained from the models and the real TEC data 
                         showed that the models have some deviations, therefore requiring 
                         future improvements. According to the results, the deviations may 
                         reach approximately 7 m and are originated from physical 
                         peculiarities on the spatial environment over the Brazilian 
                         region. (.",
                  doi = "10.1016/j.asr.2020.12.015",
                  url = "http://dx.doi.org/10.1016/j.asr.2020.12.015",
                 issn = "0273-1177 and 1879-1948",
             language = "en",
           targetfile = "silva_evaluation.pdf",
        urlaccessdate = "09 maio 2024"
}