@Article{Agyei-YeboahPMBPELTW:2019:SeVaPl,
               author = "Agyei-Yeboah, Ebenezer and Paulino, Igo and Medeiros, Amauri 
                         Fragaso and Buriti, Ricardo Arlen and Paulino, Ana Roberta and 
                         Essien, Patrick and Lomotey, Solomon Otoo and Takahashi, Hisao and 
                         Wrasse, Cristiano Max",
          affiliation = "{Universidade do Vale do Para{\'{\i}}ba (UNIVAP)} and 
                         {Universidade Federal de Campina Grande (UFCG)} and {Universidade 
                         Federal de Campina Grande (UFCG)} and {Universidade Federal de 
                         Campina Grande (UFCG)} and {Universidade Federal de Campina Grande 
                         (UFCG)} 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 = "Seasonal variation of plasma bubbles during solar cycle 23–24 over 
                         the Brazilian equatorial region",
              journal = "Advances in Space Research",
                 year = "2019",
               volume = "64",
               number = "7",
                pages = "1365--1374",
                month = "Oct.",
             keywords = "Solar cycle, Plasma bubbles, All-sky imaging, Equatorial 
                         ionosphere.",
             abstract = "In this study, OI 630.0 nm nightglow image data obtained from an 
                         all-sky imaging station located at Sao Joao do Cariri (7.4S, 36.5 
                         W), have been used to study the occurrence of equatorial plasma 
                         bubbles (EPBs) over the Brazilian equatorial region. The 
                         observations, which took place from September 2000 to December 
                         2010 (almost eleven years), covered a significant part of solar 
                         cycle 23 (descending phase of SC23) and the very beginning of 
                         solar cycle 24 (ascending phase of SC24). There were 1337 nights 
                         of observations with 666 nights with EPB events, which translates 
                         to an occurrence rate of 49.8%. Of these nights, 1290 were 
                         considered quiet (Dst - 50 nT) with 50% plasma bubbles occurrence 
                         rate. The occurrence of EPBs was studied under three solar 
                         activity phases high solar activity phase (HSA, September 2000 
                         March 2004), moderate solar activity phase (MSA or descending 
                         phase, March 2004 October 2006) and low solar activity phase (LSA, 
                         October 2006 December 2010). The low solar activity phase is part 
                         of the peculiar solar cycle 24, considered the weakest in over a 
                         century with most sunspotless days (20082009). The maximum 
                         occurrence of bubbles, equal to 54.2%, was found during the HSA 
                         phase, with percentages characterizing MSA and LSA being 
                         respectively 52.4% and 45.8%. The analysis also showed clear 
                         seasonal variation in the EPB occurrence with maximum rates in 
                         summer, spring, autumn, and the minimum rates in winter for all 
                         solar activity phases. Overall, there was observed solar cycle 
                         variation in each season with maximum occurrence in HSA followed 
                         by MSA and then LSA except in autumn where higher occurrence rate 
                         was observed in LSA phase than in MSA phase.",
                  doi = "10.1016/j.asr.2019.06.041",
                  url = "http://dx.doi.org/10.1016/j.asr.2019.06.041",
                 issn = "0273-1177 and 1879-1948",
             language = "en",
           targetfile = "agyei_sesonal.pdf",
        urlaccessdate = "15 jun. 2024"
}