@InProceedings{SantosBrBaSoAbSo:2021:ReInLa,
               author = "Santos, Angela and Brum, Christiano Garnett Marques and Batista, 
                         Inez Staciarini and Sobral, Jos{\'e} Humberto Andrade and Abdu, 
                         Mangalathayil Ali and Souza, Jonas Rodrigues de",
          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)}",
                title = "Response of the Intermediate Layers at Brazilian low latitude to 
                         geomagnetic activity during the solar minimum of 2009",
                 year = "2021",
         organization = "General Assembly of International Union Science (URSI GASS)",
             abstract = "In this study, we investigate the dependence of the intermediate 
                         layers (ILs) altitudes/vertical velocities on the geomagnetic 
                         activity during the rather extended duration solar minimum of 
                         2009. Based on an empirical climatological model developed from 
                         Digisonde data over the Brazilian low latitude station Cachoeira 
                         Paulista (22.42° S; 45° W, I: -34.4°), the virtual height (hIL) 
                         and the top frequency (ftIL) of the ILs were analyzed as a 
                         function of the different levels of Kp index. Our results show 
                         that even a small variation in the geomagnetic activity during low 
                         solar activity can affect the ILs altitudes over Cachoeira 
                         Paulista. A downward movement of the ILs probably due to an 
                         overshielding electric field was observed during the early 
                         morning. Besides that, during daytime, the smooth rise of the ILs 
                         can be related to the regular undisturbed day-to-day F-region 
                         zonal electric field of the ionosphere.",
  conference-location = "Online",
      conference-year = "27 aug.-04 sept.",
             language = "en",
           targetfile = "santos_2021.pdf",
        urlaccessdate = "03 maio 2024"
}