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@Article{CardosoAlPaFiSiCoKo:2017:AuPrEn,
               author = "Cardoso, F. R. and Alves, Maria Virginia and Parks, G. K. and 
                         Fillingim, M. O . and Sim{\~o}es Junior, F. J. R. and Costa 
                         J{\'u}nior, E. and Koga, Daiki",
          affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {University of California} and 
                         {University of California} and {Universidade Federal de Pelotas 
                         (UFPEL)} and {Instituto Federal de Minas Gerais} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Auroral precipitating energy during long magnetic storms",
              journal = "Journal of Geophysical Research: Space Physics",
                 year = "2017",
               volume = "122",
                pages = "2016JA023780",
             keywords = "electron precipitation, POLAR data, auroral region.",
             abstract = "The power energy input carried by precipitating electrons into the 
                         auroral zone is an important parameter for understanding the solar 
                         wind-magnetosphere energy transfer processes and magnetic storms 
                         triggering. Some magnetic storms present a peculiar long recovery 
                         phase, lasting for many days or even weeks, which can be 
                         associated with the intense and long-duration auroral activity 
                         named HILDCAA (High Intensity Long Duration Continuous AE 
                         Activity). The auroral energy input during HILDCAAs has been 
                         pointed out as an essential key issue, although there have been 
                         very few quantitative studies on this topic. In the present work, 
                         we have estimated the auroral electron precipitating energy during 
                         the events of long (LRP) and short (SRP) storm recovery phase. The 
                         energy has been calculated from the images produced by the 
                         Ultraviolet Imager (UVI) on board the Polar satellite. In order to 
                         obtain accurate energy values, we developed a dayglow estimate 
                         method to remove solar contamination from the UVI images, before 
                         calculating the energy. We compared the UVI estimate to the 
                         Hemispheric Power (HP), to the empirical power obtained from the 
                         AE index, and to the solar wind input power. Our results showed 
                         that the UVI electron precipitating power for the LRP events 
                         presented a quasiperiodic fluctuation, which has been confirmed by 
                         the other estimates. We found that the LRP events are a 
                         consequence of a directly driven system, where there is no 
                         long-term energy storage in the magnetosphere, and the auroral 
                         electrojets during these events are directly affected by the 
                         electron precipitating power.",
                  doi = "10.1002/2016ja023780",
                  url = "http://dx.doi.org/10.1002/2016ja023780",
                 issn = "2169-9402",
                label = "lattes: 6460301165792800 2 CardosoAlPaFiJrJrKo:2017:AuPrEn",
             language = "en",
           targetfile = "cardoso_auroral.pdf",
                  url = "http://onlinelibrary.wiley.com/doi/10.1002/2016JA023780/full",
        urlaccessdate = "24 nov. 2020"
}


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