@Article{SantosBrBaSoAbSo:2022:ReInLa,
               author = "Santos, Angela Machado dos and Brum, Christiano G. M. 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 = "Responses of intermediate layers to geomagnetic activity during 
                         the 2009 deep solar minimum over the Brazilian low-latitude 
                         sector",
              journal = "Annales Geophysicae",
                 year = "2022",
               volume = "40",
               number = "3",
                pages = "259--269",
                month = "May",
             abstract = "This work presents the daytime behavior of the intermediate layer 
                         (ILs) parameters (the virtual height - h'IL, and the top frequency 
                         - ftIL) over the low-latitude region of Cachoeria Paulista (CP, 
                         22.42 degrees S; 45 degrees W, I: -34.59 degrees) during the 2009 
                         deep solar minimum. Under such a unique condition, this research 
                         reveals the ILs' quiet state seasonal behavior as well as its 
                         responses to moderate changes in the geomagnetic activity. The 
                         main results show that even small variations of geomagnetic 
                         activity (quantified by the planetary Kp index) are able to modify 
                         the dynamics of the ILs parameters. For the first time, it was 
                         observed that during the summer, the h'IL decreases rapidly with 
                         the increase of geomagnetic activity, mainly in the early morning 
                         hours, while in the following hours, a smoothed rise of the IL was 
                         found in all seasons analyzed. Regarding the IL frequency, it was 
                         observed that after 12:00 LT, there is a tendency to decrease with 
                         the increase of magnetic disturbances, this characteristic being 
                         more intense after 16:00 LT for summer and winter. For the 
                         equinox, such variation was detected, however with half of the 
                         amplitude of the other seasons. In addition, the domain of the 
                         annual periodicity of the ftTL stands out, while the h'IL presents 
                         a semiannual component under the condition of geomagnetic quiet.",
                  doi = "10.5194/angeo-40-259-2022",
                  url = "http://dx.doi.org/10.5194/angeo-40-259-2022",
                 issn = "0992-7689",
             language = "en",
           targetfile = "angeo-40-259-2022.pdf",
        urlaccessdate = "27 abr. 2024"
}