@Article{HajraTsEcGoBrViSa:2015:ArPrCI,
               author = "Hajra, Rajkumar and Tsurutani, Bruce T. and Echer, Ezequiel and 
                         Gonzalez Alarcon, Walter Dem{\'e}trio and Brum, Christiano 
                         Garnett Marques and Vieira, Luis Eduardo Antunes and Santolik, 
                         Ondrej",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Relativistic electron acceleration during HILDCAA events: are 
                         precursor CIR magnetic storms important?",
              journal = "Earth, Planets and Space",
                 year = "2015",
               volume = "67",
             keywords = "HILDCAAs, High-speed streams, CIRs, Chorus plasma waves, Radiation 
                         belt, Magnetospheric relativistic electrons, Solar wind, 
                         Geomagnetic storms.",
             abstract = "We present a comparative study of high-intensity long-duration 
                         continuous AE activity (HILDCAA) events, both isolated and those 
                         occurring in the {"}recovery phase{"} of geomagnetic storms 
                         induced by corotating interaction regions (CIRs). The aim of this 
                         study is to determine the difference, if any, in relativistic 
                         electron acceleration and magnetospheric energy deposition. All 
                         HILDCAA events in solar cycle 23 (from 1995 through 2008) are used 
                         in this study. Isolated HILDCAA events are characterized by 
                         enhanced fluxes of relativistic electrons compared to the 
                         pre-event flux levels. CIR magnetic storms followed by HILDCAA 
                         events show almost the same relativistic electron signatures. 
                         Cluster 1 spacecraft showed the presence of intense whistler-mode 
                         chorus waves in the outer magnetosphere during all HILDCAA 
                         intervals (when Cluster data were available). The storm-related 
                         HILDCAA events are characterized by slightly lower solar wind 
                         input energy and larger magnetospheric/ionospheric dissipation 
                         energy compared with the isolated events. A quantitative 
                         assessment shows that the mean ring current dissipation is similar 
                         to 34 % higher for the storm-related events relative to the 
                         isolated events, whereas Joule heating and auroral precipitation 
                         display no (statistically) distinguishable differences. On the 
                         average, the isolated events are found to be comparatively weaker 
                         and shorter than the storm-related events, although the 
                         geomagnetic characteristics of both classes of events bear no 
                         statistically significant difference. It is concluded that the CIR 
                         storms preceding the HILDCAAs have little to do with the 
                         acceleration of relativistic electrons. Our hypothesis is that 
                         similar to 10-100-keV electrons are sporadically injected into the 
                         magnetosphere during HILDCAA events, the anisotropic electrons 
                         continuously generate electromagnetic chorus plasma waves, and the 
                         chorus then continuously accelerates the high-energy portion of 
                         this electron spectrum to MeV energies.",
                  doi = "10.1186/s40623-015-0280-5",
                  url = "http://dx.doi.org/10.1186/s40623-015-0280-5",
                 issn = "1343-8832",
             language = "en",
        urlaccessdate = "28 abr. 2024"
}