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@Article{HajraTsuEchGonSan:2015:ReE>0.,
               author = "Hajra, Rajkumar and Tsurutani, Bruce T. and Echer, Ezequiel and 
                         Gonzalez Alarcon, Walter Dem{\'e}trio and Santolik, Ondrei",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Relativistic (E> 0.6, > 2.0, and > 4.0 MeV) elelctron acceleration 
                         at geosynchronous orbit during high-intensity, long-duration, 
                         continuous AE activity (HILDCAA) events",
              journal = "Astrophysical Journal",
                 year = "2015",
               volume = "799",
               number = "1",
             keywords = "acceleration of particles, magnetic reconnection, relativistic 
                         processes, solar wind, waves.",
             abstract = "Radiation-belt relativistic (E > 0.6, > 2.0, and > 4.0 MeV) 
                         electron acceleration is studied for solar cycle 23 (1995-2008). 
                         High-intensity, long-duration, continuous AE activity (HILDCAA) 
                         events are considered as the basis of the analyses. All of the 35 
                         HILDCAA events under study were found to be characterized by flux 
                         enhancements of magnetospheric relativistic electrons of all three 
                         energies compared to the pre-event flux levels. For the E > 2.0 
                         MeV electron fluxes, enhancement of > 50% occurred during 100% of 
                         HILDCAAs. Cluster-4 passes were examined for electromagnetic 
                         chorus waves in the 5 < L < 10 and 0 < MLT < 12 region when wave 
                         data were available. Fully 100% of these HILDCAA cases were 
                         associated with enhanced whistler-mode chorus waves. The 
                         enhancements of E > 0.6, > 2.0, and > 4.0 MeV electrons occurred 
                         similar to 1.0 day, similar to 1.5 days, and similar to 2.5 days 
                         after the statistical HILDCAA onset, respectively. The statistical 
                         acceleration rates for the three energy ranges were similar to 1.8 
                         x 10(5), 2.2 x 10(3), and 1.0 x 10(1) cm(-2) s(-1) sr(-1) d(-1), 
                         respectively. The relativistic electron-decay timescales were 
                         determined to be similar to 7.7, 5.5, and 4.0 days for the three 
                         energy ranges, respectively. The HILDCAAs were divided into 
                         short-duration (D <= 3 days) and long-duration (D > 3 days) events 
                         to study the dependence of relativistic electron variation on 
                         HILDCAA duration. For long-duration events, the flux enhancements 
                         during HILDCAAs with respect to pre-event fluxes were similar to 
                         290%, 520%, and 82% for E > 0.6, > 2.0, and > 4.0 MeV electrons, 
                         respectively. The enhancements were similar to 250%, 400%, and 27% 
                         respectively, for short-duration events. The results are discussed 
                         with respect to the current understanding of radiation-belt 
                         dynamics.",
                  doi = "10.1088/0004-637X/799/1/39",
                  url = "http://dx.doi.org/10.1088/0004-637X/799/1/39",
                 issn = "0004-637X and 1538-4357",
             language = "en",
           targetfile = "Hajra_relativistic.pdf",
        urlaccessdate = "04 dez. 2020"
}


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