author = "Becker Guedes, F{\'a}bio and Candido, Cl{\'a}udia Maria Nicoli 
                         and Paula, Eurico Rodrigues de and Negreti, Patr{\'{\i}}cia Mara 
                         de Siqueira",
          affiliation = "{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 = "Estimation of ionospheric response to solar flares in the 
                         equatorial and low-latitude regions",
                 year = "2015",
         organization = "IUGG General Assembly, 26.",
             abstract = "Solar X-ray and extreme ultraviolet (EUV) photons are responsible 
                         for ionizing the terrestrial atmosphere and create the ionosphere. 
                         During solar flares, a fast increase in the electron density at 
                         various altitude regions takes place due to the abrupt enhance of 
                         the X-ray and EUV fluxes toward Earth. With these changes in the 
                         ionosphere, radio communication and navigation can be drastically 
                         affected. The magnitudes of these kind of Space Weather events can 
                         be related to the X-ray peak brightness and the duration, which 
                         drive the intensity of the ionosphere response when the associated 
                         electromagnetic wave hit the sunlit side of the Earth atmosphere. 
                         Other aspects defining the severity of damages to HF radio 
                         communications and LF navigation signals in a certain area are the 
                         local time, the solar zenith angle, and the position of the flare 
                         in the solar disc. In order to improve the understanding of radio 
                         signal loss or degradation in the Brazilian sector due to solar 
                         X-ray emissions, we analyze total electron content (TEC) maps and 
                         curves at selected sites obtained by a GPS network formed by tents 
                         of dual-frequency receivers spread all over Brazilian territory. 
                         We observe different ionospheric local changes during several 
                         X-ray events in the 0.1-0.8 nm range identified by GOES satellite. 
                         Considering the results, we have made an estimation of the 
                         severity and range of ionospheric disturbances in the equatorial 
                         and low-latitude Brazilian region affecting space based 
                         communication for different events based on their 
  conference-location = "Prague, Czech Republic",
      conference-year = "22 June - 02 July",
        urlaccessdate = "22 jan. 2021"