author = "Santos, Jonas Rodrigues de and Batista, Inez Staciarini and Abdu, 
                         Mangalathayil Ali",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "TEC and FOF2 obtained from GNSS signals and assimilated by a 
                         physical model",
                 year = "2018",
         organization = "Simp{\'o}sio Brasileiro de Geof{\'{\i}}sica Espacial e 
                         Aeronomia, 7. (SBGEA)",
             abstract = "In this work, we use the vertical total electron content (TEC) 
                         calibrated with the Boston College code and the ionospheric 
                         critical frequency extracted from such TEC (foF2* ). The data are 
                         only for the day March 24, 2015. Three latitudinal ranges covering 
                         -30 to 30 degrees, which are distributed along the magnetic 
                         meridian crossing Jicamarca (Geog. Longitude: -77), Boa 
                         Vista-Campo Grande (Geog. Longitude: -57) and S{\~a}o 
                         Lu{\'{\i}}s (Geog. Longitude: -44), respectively. First of all, 
                         our assimilation data consist of a latitudinal adjustment of the 
                         electron density calculated by the Sheffield University 
                         Plasmasphere Ionosphere Model at INPE (SUPIM-INPE) applying the 
                         same proportion as obtained from the ratio between the observed 
                         TEC and calculated by SUPIM-INPE. After that, if it is identified 
                         discrepancies between calculated and foF2* values, a second 
                         adjustment is applied considering also the proportional difference 
                         between calculated and extracted critical frequency (foF2* ). 
                         Observational data of F-region critical frequency (foF2) and TEC 
                         from digisondes operating at Boa Vista, S{\~a}o Lu{\'{\i}}s and 
                         Campo Grande were also used in the result validations. In general, 
                         TEC values obtained with Boston College code show good agreement 
                         with those from digisondes for all locations, except over S{\~a}o 
                         Lu{\'{\i}}s near 00 and 12 UT and over Campo Grande after 14 UT. 
                         The direct results from SUPIM-INPE, i.e., the results without data 
                         assimilation, for both foF2 and TEC have not shown good agreement 
                         with the observational data. On the other hand, it was found 
                         excellent results (the results match with observations), mainly 
                         for foF2, after applying the data assimilation.",
  conference-location = "Santa Maria, RS",
      conference-year = "05-09 nov",
             language = "pt",
           targetfile = "souza_tec.pdf",
        urlaccessdate = "30 nov. 2020"