@Article{SantosBBSASCDJVN:2022:CaSt,
               author = "Santos, Angela Machado dos and Brum, C. G. M. and Batista, Inez 
                         Staciarini and Sobral, Jos{\'e} Humberto Andrade and Abdu, 
                         Mangalathayil Ali and Souza, Jonas Rodrigues de and Chen, Sony Su 
                         and Denardini, Clezio Marcos and Jesus, Rodolfo de and Venkatesh, 
                         K. and Nogueira, Paulo A. B.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Arecibo 
                         Observatory} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Physical Research Laboratory} and Instituto Federal 
                         de Educa{\c{c}}{\~a}o, Ci{\^e}ncia e Tecnologia de S{\~a}o 
                         Paulo (IFSP)",
                title = "Anomalous Responses of the F-2 Layer Over the Brazilian Equatorial 
                         Sector During a Counter Electrojet Event: A Case Study",
              journal = "Journal of Geophysical Research: Space Physics",
                 year = "2022",
               volume = "127",
               number = "9",
                pages = "e2022JA030584",
                month = "Sept.",
             keywords = "gravity wave, counter electrojet.",
             abstract = "In this work, we report the ionospheric F-layer responses over the 
                         Brazilian equatorial sector to a counter electrojet event that 
                         occurred during the solar minimum period of June 2009. The data 
                         collected by the Digisonde over Sao Luis (2.33 degrees S; 44 
                         degrees W; I: -4751 degrees; Dip. Lat. 238 degrees S) showed a 
                         strong modification in the ionospheric F-2 layer trace, which in 
                         this case appeared to be {"}broken in half.{"} In this process, 
                         the first part of the F-2 layer (lower frequency) was thrown down 
                         whilst the upper part remained at higher altitudes. Such 
                         characteristics occurred simultaneously with an abrupt decrease in 
                         the strength of equatorial electrojet and with intensification in 
                         the auroral activity. The origin of this phenomenon seems to have 
                         a local nature and seems not to be connected to any magnetic 
                         disturbance since similar responses were not observed in other 
                         longitudinal and latitudinal sectors. Excluding this possibility, 
                         we assume that the strong changes observed in the F layer over Sao 
                         Luis had been caused probably by the gravity wave (GW) 
                         propagation, as seen in the downward phase propagation of the 
                         altitude contours with time over Sao Luis and Fortaleza and the 
                         remarkable signatures in ionograms over both regions, such as the 
                         forking traces that are typically caused by GWs.",
                  doi = "10.1029/2022JA030584",
                  url = "http://dx.doi.org/10.1029/2022JA030584",
                 issn = "2169-9402",
             language = "en",
           targetfile = "JGR Space Physics - 2022 - Santos - Anomalous Responses of the F2 
                         Layer Over the Brazilian Equatorial Sector During a.pdf",
        urlaccessdate = "01 maio 2024"
}