@Article{SantosBaSoBrAbSo:2020:SoDiDy,
               author = "Santos, Angela Machado dos and Batista, Inez Staciarini and 
                         Sobral, Jos{\'e} Humberto Andrade and Brum, Christiano Garnett 
                         Marques and Abdu, Mangalathayil Ali and Souza, Jonas Rodrigues 
                         de",
          affiliation = "{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)}",
                title = "Some differences in the dynamics of the intermediate descending 
                         layers observed during periods of maximum and minimum solar flux",
              journal = "Journal of Geophysical Research: Space Physics",
                 year = "2020",
               volume = "125",
               number = "10",
                pages = "e2019JA027682",
                month = "Oct.",
             abstract = "In this paper, ionograms from S{\~a}o Lu{\'{\i}}s (SL, 2°S; 
                         44°W, I: \−3.8°) and Cachoeira Paulista (CP, 22.42°S; 45°W, 
                         I: \−34.4°) are analyzed to examine the characteristics of 
                         the intermediate descending layers (ILs) over the Brazilian 
                         equatorial and low\‐latitude regions under different solar 
                         flux conditions. The solar flux effects on the ILs are 
                         investigated in terms of the rate of occurrence of the IL; the 
                         seasonal behavior of some parameters such as the height, 
                         frequency, and velocity; and the duration and the number of ILs 
                         events observed per day. One of the main results of this work is 
                         that unlike over CP, the ILs over SL presented some peculiarities, 
                         such as a lower rate of occurrence during a period of solar 
                         maximum activity (2003) when compared with a period of solar 
                         minimum activity (2009). This apparent variation was likely caused 
                         by the magnetic equator moving away from SL during this period. 
                         The duration of the ILs was also investigated, and it was found 
                         that in 2009, the ILs presented higher life time than in 2003. The 
                         descending velocity of the ILs is compatible with the semidiurnal 
                         and quarter\‐diurnal tides. Over SL, the larger descending 
                         rate in some cases (>10 km/hr) may reveal the additional influence 
                         of the gravity waves in the IL's dynamics.",
                  doi = "10.1029/2019JA027682",
                  url = "http://dx.doi.org/10.1029/2019JA027682",
                 issn = "2169-9402",
             language = "en",
           targetfile = "santos_some.pdf",
        urlaccessdate = "28 abr. 2024"
}