@InProceedings{JonahPaulKher:2013:ObSiEq,
               author = "Jonah, Olusegun and de Paula, Eurico R. and Kherani, Alam",
          affiliation = "{} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Observations and simulations of equinoctial asymmetry during low 
                         and high solar activities",
                 year = "2013",
         organization = "International Congress of the Brazilian Geophysical Society and 
                         EXPOGEf, 13.",
             keywords = "equinoctial asymmetry.",
             abstract = "Employing a dual frequency GPS receiver and using the SAMI2 
                         ionospheric model at the equatorial stations (S{\~a}o 
                         Lu{\'{\i}}s(salu) and Arequipa(areq)) and low-latitude stations 
                         (Cachoeira Paulista(chpi) and Porto Alegre(poal)), the measurement 
                         of the ionospheric total electron content (TEC) have been 
                         estimated for March and September equinoxes months during an 
                         extremely low solar activity of 2009 and an extremely high solar 
                         activity of 2001. The seasonal behavior of the ionosphere have 
                         been investigated for several decades but the differences of the 
                         ionosphere between the March and September equinoxes are still an 
                         open question. The analysis reveals that during low and high solar 
                         activities, the equinoctial asymmetry in the ionospheic plasma 
                         density is a phenomenon of both the low-latitude and equatorial 
                         region and occurs during both solar activities. The SAMI2 model 
                         was used to investigate the observed GPS TEC behavior and its 
                         reveals that, besides the important effects of the meridional wind 
                         and of the electric field effect (ExB drift), the thermospheric 
                         temperature and O/N2 also plays an important role in the forming 
                         of the observed equinoctial asymmetry particularly around the 
                         magnetic equator in the ionosphere.",
  conference-location = "Rio de Janeiro",
      conference-year = "2013",
                label = "self-archiving-INPE-MCTI-GOV-BR",
             language = "en",
           targetfile = "sbgf_2013_Jonah.pdf",
        urlaccessdate = "16 jun. 2024"
}