author = "Jesus, Rodolfo de and Batista, Inez Staciarini and Fagundes, P. R. 
                         and Venkatesh, K. and Abreu, A. J. de",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade do Vale 
                         do Para{\'{\i}}ba (UNIVAP)} and {Universidade do Vale do 
                         Para{\'{\i}}ba (UNIVAP)} and {Instituto Tecnol{\'o}gico de 
                         Aeron{\'a}utica (ITA)}",
                title = "Ionospheric response to the 2006 sudden stratospheric warming 
                         event over the equatorial and low latitudes in the Brazilian 
                         sector using GPS observations",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2017",
               volume = "154",
                pages = "92--103",
                month = "Feb.",
             keywords = "Ionosphere, Ionospheric irregularities, Stratosphere-ionosphere 
                         coupling, Sudden stratospheric warming.",
             abstract = "The main purpose of this paper is to study the response of the 
                         ionospheric F-region using GPS-TEC measurements at equatorial and 
                         low latitude regions over the Brazilian sector during an sudden 
                         stratospheric warming (SSW) event in the year 2006. In this work, 
                         we present vertical total electron content (VTEC) and phase 
                         fluctuations derived from GPS network in Brazil. The continuous 
                         wavelet transform (CWT) was employed to check the periodicities of 
                         the \∆VTEC during the SSW event. The results show a strong 
                         decrease in VTEC and \∆VTEC values in the afternoon over 
                         low latitudes from DOY 0539 (during the SSW event) mainly after 
                         the second SSW temperature peak. The ionospheric \∆VTEC 
                         pattern over Brazilian sector shows diurnal and semidiurnal 
                         oscillations during the 2006 SSW event. In addition, for the first 
                         time, variations in \∆VTEC (low latitude stations) with 
                         periods of about 0208 day have been reported during an SSW event. 
                         Using GPS stations located in the Brazilian sector, it is reported 
                         for the first time that equatorial ionospheric irregularities were 
                         not suppressed by the SSW event.",
                  doi = "10.1016/j.jastp.2016.12.005",
                  url = "http://dx.doi.org/10.1016/j.jastp.2016.12.005",
                 issn = "1364-6826",
             language = "en",
           targetfile = "jesus_ionospheric.pdf",
        urlaccessdate = "01 dez. 2020"