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@Article{SouzaEcheBolzHajr:2018:CrCrAn,
               author = "Souza, Adriane Marques de and Echer, Ezequiel and Bolzan, Mauricio 
                         Jos{\'e} Alves and Hajra, Rajkumar",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal 
                         de Jata{\'{\i}}} and Laboratoire de Physique et Chimie de 
                         l’Environnement et de l’Espace, CNRS",
                title = "Cross-correlation and cross-wavelet analyses of the solar wind IMF 
                         Bz and auroral electrojet index AE coupling during HILDCAAs",
              journal = "Annales Geophysicae",
                 year = "2018",
               volume = "36",
               number = "1",
                pages = "205--211",
             keywords = "Magnetospheric physics (solar-wind– magnetosphere interactions).",
             abstract = "Solar-windgeomagnetic activity coupling during high-intensity 
                         long-duration continuous AE (auroral electrojet) activities 
                         (HILDCAAs) is investigated in this work. The 1 min AE index and 
                         the interplanetary magnetic field (IMF) Bz component in the 
                         geocentric solar magnetospheric (GSM) coordinate system were used 
                         in this study. We have considered HILDCAA events occurring between 
                         1995 and 2011. Cross-wavelet and cross-correlation analyses 
                         results show that the coupling between the solar wind and the 
                         magnetosphere during HILDCAAs occurs mainly in the period 
                         \≤ 8 h. These periods are similar to the periods observed 
                         in the interplanetary Alfv{\'e}n waves embedded in the high-speed 
                         solar wind streams (HSSs). This result is consistent with the fact 
                         that most of the HILDCAA events under present study are related to 
                         HSSs. Furthermore, the classical correlation analysis indicates 
                         that the correlation between IMF Bz and AE may be classified as 
                         moderate (0.40.7) and that more than 80 % of the HILDCAAs exhibit 
                         a lag of 2030 min between IMF Bz and AE. This result corroborates 
                         with Tsurutani et al. (1990) where the lag was found to be close 
                         to 2025 min. These results enable us to conclude that the main 
                         mechanism for solar-windmagnetosphere coupling during HILDCAAs is 
                         the magnetic reconnection between the fluctuating, negative 
                         component of IMF Bz and Earths magnetopause fields at periods 
                         lower than 8 h and with a lag of about 2030 min.",
                  doi = "10.5194/angeo-36-205-2018",
                  url = "http://dx.doi.org/10.5194/angeo-36-205-2018",
                 issn = "0992-7689",
                label = "self-archiving-INPE-MCTIC-GOV-BR",
             language = "en",
           targetfile = "souza_cross.pdf",
        urlaccessdate = "28 nov. 2020"
}


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