@Article{HajraEcheTsurGonz:2014:SoCySe,
               author = "Hajra, Rajkumar and Echer, Ezequiel and Tsurutani, B. T. and 
                         Gonzalez, Walter Demetrio",
          affiliation = "Instituto Nacional de Pesquisas Espaciais (INPE), Av. dos 
                         Astronautas, 1758Sao Jose dos Campos, Brazil and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and Jet Propulsion 
                         Laboratory, California Institute of Technology, 4800 Oak Grove 
                         Drive PasadenaCA, United States and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Superposed epoch analyses of HILDCAAs and their interplanetary 
                         drivers: Solar cycle and seasonal dependences",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2014",
               volume = "121",
               number = "PA",
                pages = "24--31",
             keywords = "CIRs, High-speed streams, HILDCAAs, Seasonal dependence, Solar 
                         cycle, Superposed-epoch analysis.",
             abstract = "We study the solar cycle and seasonal dependences of 
                         high-intensity, long-duration, continuous AE activity (HILDCAA) 
                         events and associated solar wind/interplanetary external drivers 
                         for ~312 solar cycle period, from 1975 to 2011. 99 HILDCAAs which 
                         had simultaneous solar wind/interplanetary data are considered in 
                         the present analyses. The peak occurrence frequency of HILDCAAs 
                         was found to be in the descending phase of the solar cycle. These 
                         events had the strongest time-integrated AE intensities and were 
                         coincident with peak occurrences of high-speed solar wind streams. 
                         The event initiations were statistically coincident with 
                         high-to-slow speed stream interactions, compressions in the solar 
                         wind plasma and interplanetary magnetic field (IMF). The latter 
                         were corotating interaction regions (CIRs). The signatures of 
                         related CIRs were most prominent for the events occurring during 
                         the descending and solar minimum phases of the solar cycles. For 
                         these events, the solar wind speed increased by ~41% and ~57% 
                         across the CIRs, respectively. There was weak or no stream-stream 
                         interaction or CIR structure during the ascending and solar 
                         maximum phases. HILDCAAs occurring during spring and fall seasons 
                         were found to occur preferentially in negative and positive IMF 
                         sector regions (toward and away from the Sun), respectively.",
                  doi = "10.1016/j.jastp.2014.09.012",
                  url = "http://dx.doi.org/10.1016/j.jastp.2014.09.012",
                 issn = "1364-6826",
                label = "scopus 2014-11 HajraEcheTsurGonz:2014:SoCySe",
             language = "en",
           targetfile = "Hajra_superposed.pdf",
        urlaccessdate = "28 abr. 2024"
}