@Article{SouzaEcheBolzHajr:2016:StMaPe,
               author = "Souza, Adriane Marques de and Echer, Ezequiel and Bolzan, M. J. A. 
                         and Hajra, Rajkumar",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "A study on the main periodicities in interplanetary magnetic field 
                         Bz component and geomagnetic AE index during HILDCAA events using 
                         wavelet analysis",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2016",
               volume = "149",
                pages = "81--86",
                month = "Nov.",
             keywords = "Geomagnetic activity, HILDCAAs, Magnetosphere, Wavelet.",
             abstract = "The interplanetary and geomagnetic characteristics of 
                         High-Intensity Long-Duration Continuous AE Activity (HILDCAA) 
                         events are studied using wavelet analysis technique. The Morlet 
                         wavelet transform was applied to the 1 min interplanetary magnetic 
                         field (IMF) Bz component and the geomagnetic AE index during 
                         HILDCAA events. We have analyzed the AE data for the events 
                         occurring between 1975 and 2011, and the IMF Bz data (both in GSE 
                         and GSM) for the events between 1995 and 2011. We analyzed the 
                         scalograms and the global wavelet spectrum of the parameters. For 
                         50% of all HILDCAA events, the main periodicities of the AE index 
                         are generally between 4 and 12 h. For the Bz component, the main 
                         periodicities were found to be less than 8 h for ~56% of times in 
                         GSM system and for ~54% of times in GSE system. It is conjectured 
                         that the periodicities might be associated with the Alfv{\'e}n 
                         waves which have typical periods between 1 and 10 h. The results 
                         are discussed in the light of self organized criticality theory 
                         where the physical events have the capacity of releasing a 
                         considerable amount of energy in a short interval of time.",
                  doi = "10.1016/j.jastp.2016.09.006",
                  url = "http://dx.doi.org/10.1016/j.jastp.2016.09.006",
                 issn = "1364-6826",
             language = "en",
           targetfile = "souza_a study.pdf",
        urlaccessdate = "28 abr. 2024"
}