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@InProceedings{PaulaMNMCASCMVBS:2019:DaGNSi,
               author = "Paula, Eurico Rodrigues de and Martinon, Andr{\'e} Ricardo 
                         Fazanaro and Neri, Jos{\'e} Angelo da Costa Ferreira and Moraes, 
                         Alison de Oliveira and Cecatto, Jos{\'e} Roberto and Abdu, 
                         Mangalathayil Ali and Sobral, Jos{\'e} Humberto Andrade and Cunha 
                         Neto, Ac{\'a}cio and Monico, Jo{\~a}o Francisco Galera and Vani, 
                         Bruno Cesar and Batista, Inez Staciarini 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 de Aeron{\'a}utica e 
                         Espa{\c{c}}o (IAE)} 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 
                         {Universidade Estadual Paulista (UNESP)} and {Universidade 
                         Estadual Paulista (UNESP)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)}",
                title = "Daytime GNSS signal fading and scintillation associated with solar 
                         burst events",
                 year = "2019",
         organization = "AGU Fall Meeting",
             abstract = "Daytime GNSS data from Brazilian longitudinal sector were analyzed 
                         during some solar burst events of different intensities. These 
                         events were chosen using data from the RF solar observatories and 
                         the GOES X-ray flux. Even during low solar activity period, the 
                         bursts can occur with durations of a few tens of seconds up to few 
                         hours depending on the intensity. During these events, GPS, 
                         GLONASS, Galileo constellations and SBAS signals presented 
                         simultaneous fadings up to 5 dBs and 10 dBs in the L1 and L2 
                         frequencies, respectively. The daytime S4 amplitude scintillation 
                         indices up to 0.4 were also simultaneously observed in all 
                         satellites signals. With the aim of understanding the physical 
                         mechanisms responsible for such abnormal GNSS signal behavior 
                         during these events, magnetometer and Digisonde data were also 
                         analyzed. Large variation in the magnetometer H component and in 
                         the ionogram parameters were observed compared to quiet time. 
                         During some of the analyzed events the ionospheric F layer base 
                         represented by h´F presented large values following data gaps due 
                         to the total or partial absorption of the HF wave caused by the 
                         increased D region density due to the solar burst. Depending on 
                         the solar burst intensity and duration the GNSS receivers may fail 
                         to produce accurate navigation solution, thus making it important 
                         to study this kind of phenomenon. This work may contribute also to 
                         better understand the physics of the burst effects in the 
                         ionosphere and how to mitigate their effects on the positioning 
                         and navigation systems oriented by satellite.",
  conference-location = "San Francisco, CA",
      conference-year = "09-13 dec.",
             language = "en",
           targetfile = "paula_daytime.pdf",
        urlaccessdate = "28 mar. 2024"
}


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