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@Article{SouzaLJSPSMAKMRG:2017:AcRaBe,
               author = "Souza, Vitor Moura and Lopez, R. E. and Jauer, Paulo Ricardo and 
                         Sibeck, D. G. and Pham, K. and Silva, L. A. da and Marchezi, 
                         Jos{\'e} Paulo and Alves, Livia Ribeiro and Koga, Daiki and 
                         Medeiros, Cl{\'a}udia and Rockenbach da Silva, Marlos and 
                         Gonzalez Alarcon, Walter Dem{\'e}trio",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {University 
                         of Texas at Arlington} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and NASA/Goddard Space Flight Center, Greenbelt 
                         and {West Virginia University} and {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)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Acceleration of radiation belt electrons and the role of the 
                         average interplanetary magnetic field Bz component in high-speed 
                         streams",
              journal = "Journal of Geophysical Research: Space Physics",
                 year = "2017",
               volume = "122",
                pages = "10084--10101",
             abstract = "In this study we examine the recovery of relativistic radiation 
                         belt electrons on 1516 November 2014, after a previous reduction 
                         in the electron flux resulting from the passage of a corotating 
                         interaction region (CIR). Following the CIR, there was a period of 
                         high-speed streams characterized by large, nonlinear fluctuations 
                         in the interplanetary magnetic field (IMF) components. However, 
                         the outer radiation belt electron flux remained at a low level for 
                         several days before it increased in two major steps. The first 
                         increase is associated with the IMF background field turning from 
                         slightly northward on average to slightly southward on average. 
                         The second major increase is associated with an increase in the 
                         solar wind velocity during a period of southward average IMF 
                         background field. We present evidence that when the IMF Bz is 
                         negative on average, the whistler mode chorus wave power is 
                         enhanced in the outer radiation belt, and the amplification of 
                         magnetic integrated power spectral density in the ULF frequency 
                         range, in the nightside magnetosphere, is more efficient as 
                         compared to cases in which the mean IMF Bz is positive. 
                         Preliminary analysis of the time evolution of phase space density 
                         radial profiles did not provide conclusive evidence on which 
                         electron acceleration mechanism is the dominant. We argue that the 
                         acceleration of radiation belt electrons requires (i) a seed 
                         population of keV electrons injected into the inner magnetosphere 
                         by substorms and both (ii) enhanced whistler mode chorus waves 
                         activity as well as (iii) large-amplitude MHD waves.",
                  doi = "10.1002/2017JA024187",
                  url = "http://dx.doi.org/10.1002/2017JA024187",
                 issn = "2169-9402",
             language = "en",
           targetfile = "souza_acceleration.pdf",
        urlaccessdate = "04 dez. 2020"
}


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