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@InProceedings{CandidoBKNBPSC:2018:ReToEl,
               author = "Candido, Cl{\'a}udia Maria Nicoli and Batista, Inez Staciarini 
                         and Klausner, Virginia and Negreti, Patr{\'{\i}}cia Mara de 
                         Siqueira and Becker Guedes, F{\'a}bio and Paula, Eurico Rodrigues 
                         de and Shi, Jiankui and Correia, E. S.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade do Vale 
                         do Para{\'{\i}}ba (UNIVAP)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade Presbiteriana Mackenzie}",
                title = "Response of the total electron content at Brazilian low latitudes 
                         to corotating interaction region and high-speed streams during 
                         solar minimum 2008",
                 year = "2018",
         organization = "Simp{\'o}sio Brasileiro de Geof{\'{\i}}sica Espacial e 
                         Aeronomia, 7. (SBGEA)",
             abstract = "In this work, we investigate the Brazilian low latitude 
                         ionospheric response to two Corotating Interaction Region (CIRs) 
                         and High-Speed Streams (HSSs) events during the solar minimum of 
                         solar cycle 23, in 2008. The studied intervals are enclosed in the 
                         Whole Heliospheric Interval (WHI), studied by other authors, for 
                         distinct longitudinal sectors. CIRs/HSSs are structures commonly 
                         observed during the descending and low solar activity, and they 
                         are related to the occurrence of coronal holes. These events cause 
                         weak to moderate recurrent geomagnetic storms characterized by 
                         negative excursions of the interplanetary magnetic field, IMF_Bz, 
                         as well as long duration auroral activity, considered as a 
                         favorable scenario for continuous Prompt Penetration 
                         Interplanetary Electric Field (PPEF). In this study, we used the 
                         Vertical Total Electron Content (VTEC) calculated from GPS 
                         receivers database from the Brazilian Continuous Monitoring 
                         Network (RBMC) managed by the Brazilian Institute of Geography and 
                         Statistics (IBGE). Moreover, we analyzed the F-layer peak height, 
                         hmF2 and the critical plasma frequency, foF2, taken from a 
                         Digisonde installed at the southern crest of the Equatorial 
                         Ionization Anomaly (EIA), in Cachoeira Paulista, CP. It was 
                         observed that during the CIRs/HSSs-driven geomagnetic disturbances 
                         VTEC increased more than 120% over the quiet times averaged 
                         values, which is comparable to intense geomagnetic storms. On the 
                         other hand, VTEC decreases were also observed during the recovery 
                         phase of the storm. Spectral analysis using Gapped Wavelet 
                         Technique (GWT) revealed periodicities of 7, 9, 13.5 days, which 
                         are subharmonics of the solar rotation period, ~ 27 days. These 
                         periods in VTEC are closely associated with those observed in 
                         solar and geomagnetic indices such as Vsw, IMF_Bz, and AE during 
                         CIRs/HSSs intervals. We discuss PPEF associated to IMF_Bz 
                         reconnection processes and the auroral activity as the most 
                         probable causes for the VTEC variations. These results can be of 
                         interest for studies related to Space Weather monitoring, modeling 
                         and forecasting, especially during low solar activity.",
  conference-location = "Santa Maria, RS",
      conference-year = "05-09 nov",
             language = "pt",
        urlaccessdate = "18 jan. 2021"
}


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